loudmouth (n.) Look up loudmouth at Dictionary.com
also loud-mouth, "loud or talkative person," 1872, from loud (adj.) + mouth (n.).
loudness (n.) Look up loudness at Dictionary.com
Old English hludnis "loudness, clamor;" see loud + -ness.
loudspeaker (n.) Look up loudspeaker at Dictionary.com
also loud-speaker, 1884, from loud (adj.) + speaker.
lough (n.) Look up lough at Dictionary.com
"a lake, pool," early 14c., Anglo-Celtic, representing a northern form of Irish and Gaelic loch, Welsh llwch, from PIE root *laku- (see lake (n.1)).
Louis Look up Louis at Dictionary.com
masc. proper name, from French Louis, from Old French Loois, probably via Medieval Latin Ludovicus, a Latinization of Old High German Hluodowig, literally "famous in war" (cognate with Clovis; for etymology, see Ludwig). Louis Quatorze (1855) refers to styles reminiscent of the time of King Louis XIV of France (1643-1715).
Louise Look up Louise at Dictionary.com
also Louisa, fem. proper name, fem. of Louis.
Louisiana Look up Louisiana at Dictionary.com
named 1682 by French explorer la Salle for Louis XIV of France. The name originally applied to the entire Mississippi basin.
lounge (v.) Look up lounge at Dictionary.com
"to loll idly," c. 1500, Scottish, of uncertain origin, perhaps [Barnhart] from French s'allonger (paresseusement) "to lounge about, lie at full length," from Old French alongier "lengthen," from Latin longus "long" (see long (adj.)). Another etymology traces it through obsolete lungis (n.) "slow, lazy person" (c. 1560), from Middle French longis, a generic application of Longinus, supposed to be the name of the centurion who pierced Christ's side with a spear in John xix:34. Popular etymology associated the name directly with long (adj.). Related: Lounged; lounging.
lounge (n.) Look up lounge at Dictionary.com
"comfortable drawing room," 1881, from lounge (v.); in the sense of "couch on which one can lie at full length," it is attested from 1830. Lounge lizard is by 1917, perhaps from 1912, a term of contempt, originally in reference to men who hung around in tea rooms to flirt.
loupe (n.) Look up loupe at Dictionary.com
"watchmaker's magnifier," 1909, from French loupe.
lour (v.) Look up lour at Dictionary.com
"to frown," late 13c. variant of lower (v.2). Related: Loured; louring.
louse (n.) Look up louse at Dictionary.com
"parasitic insect infecting human hair and skin," Old English lus, from Proto-Germanic *lus (cognates: Old Norse lus, Middle Dutch luus, Dutch luis, Old High German lus, German Laus), from PIE *lus- "louse" (cognates: Welsh lleuen "louse"). Slang meaning "obnoxious person" is from 1630s. The plural lice (Old English lys) shows effects of i-mutation. The verb meaning "to clear of lice" is from late 14c.; to louse up "ruin, botch" first attested 1934, from the literal sense (of bedding), from 1931. Grose ["Dictionary of the Vulgar Tongue," 1785] has louse ladder "A stitch fallen in a stocking."
lousy (adj.) Look up lousy at Dictionary.com
mid-14c., lousi, "infested with lice," from louse + -y (2). Figurative use as a generic adjective of abuse dates from late 14c.; sense of "swarming with" (money, etc.) is American English slang from 1843. Related: Lousiness.
lout (n.) Look up lout at Dictionary.com
1540s, "awkward fellow, clown, bumpkin," perhaps from a dialectal survival of Middle English louten (v.) "bow down" (c. 1300), from Old English lutan "bow low," from Proto-Germanic *lut- "to bow, bend, stoop" (cognates: Old Norse lutr "stooping," which might also be the source of the modern English word), from PIE *leud- "to lurk" (cognates: Gothic luton "to deceive," Old English lot "deceit), also "to be small" (see little). Non-Germanic cognates probably include Lithuanian liudeti "to mourn;" Old Church Slavonic luditi "to deceive," ludu "foolish." Sense of "cad" is first attested 1857 in British schoolboy slang.
loutish (adj.) Look up loutish at Dictionary.com
1550s, from lout + -ish. Related: Loutishly; loutishness.
louver (n.) Look up louver at Dictionary.com
also louvre, early 14c., "domed turret-like structure atop a building to disperse smoke and admit light," from Old French lovier, of uncertain origin. One theory connects it to Medieval Latin *lodarium, which might be from a Germanic source (compare Old High German louba "upper room, roof;" see lobby). Another suggests it is from French l'ouvert, literally "the open place," from le, definite article, + past participle of ouvrir "to open." Meaning "overlapping strips in a window (to let in air but keep out rain)" first recorded 1550s. The form has been influenced by apparently unrelated French Louvre, the name of the palace in Paris, which is said to be so named because its builder, Philip Augustus, intended it as a wolf kennel. Related: Louvered.
lovable (adj.) Look up lovable at Dictionary.com
also loveable, mid-14c., from love (v.) + -able. Related: Lovably.
love (n.) Look up love at Dictionary.com
Old English lufu "love, affection, friendliness," from Proto-Germanic *lubo (cognates: Old High German liubi "joy," German Liebe "love;" Old Norse, Old Frisian, Dutch lof; German Lob "praise;" Old Saxon liof, Old Frisian liaf, Dutch lief, Old High German liob, German lieb, Gothic liufs "dear, beloved").

The Germanic words are from PIE *leubh- "to care, desire, love" (cognates: Latin lubet, later libet "pleases;" Sanskrit lubhyati "desires;" Old Church Slavonic l'ubu "dear, beloved;" Lithuanian liaupse "song of praise").
"Even now," she thought, "almost no one remembers Esteban and Pepita but myself. Camilla alone remembers her Uncle Pio and her son; this woman, her mother. But soon we shall die and all memory of those five will have left the earth, and we ourselves shall be loved for a while and forgotten. But the love will have been enough; all those impulses of love return the love that made them. Even memory is not necessary for love. There is a land of the living and a land of the dead and the bridge is love, the only survival, the only meaning." [Thornton Wilder, "Bridge of San Luis Rey," 1927]
Meaning "a beloved person" is from early 13c. The sense "no score" (in tennis, etc.) is 1742, from the notion of "playing for love," i.e. "for nothing" (1670s). Phrase for love or money "for anything" is attested from 1580s. Love seat is from 1904. Love-letter is attested from mid-13c.; love-song from early 14c. To fall in love is attested from early 15c. To be in love with (someone) is from c. 1500. To make love is from 1570s in the sense "pay amorous attention to;" as a euphemism for "have sex," it is attested from c. 1950. Love life "one's collective amorous activities" is from 1919, originally a term in psychological jargon. Love affair is from 1590s. The phrase no love lost (between two people) is ambiguous and was used 17c. in reference to two who love each other well (c. 1640) as well as two who have no love for each other (1620s).
love (v.) Look up love at Dictionary.com
Old English lufian "to love, cherish, show love to; delight in, approve," from Proto-Germanic *lubojan (cognates: Old High German lubon, German lieben), from root of love (n.). Related: Loved; loving. Adjective Love-hate "ambivalent" is from 1937, originally a term in psychological jargon.
love apple (n.) Look up love apple at Dictionary.com
"tomato," 1570s, corresponding to French pomme d'amour, German liebesapfel, but the reason for the term remains obscure. One guess is that it is a corruption of Italian pomo de'Mori or Spanish pome dei Moro, literally "Moorish apple."
love bird (n.) Look up love bird at Dictionary.com
1590s, small species of West African parrot, noted for the remarkable attention mating pairs pay to one another; figurative sense of "a lover" is attested from 1911.
Hold hands, you lovebirds. [Emil Sitka]
love child (n.) Look up love child at Dictionary.com
"child born out of wedlock," 1805, from love (n.) + child. Earlier was love brat (17c.).
loveless (adj.) Look up loveless at Dictionary.com
early 14c., "feeling no love;" late 14c. "unloved," from from love (n.) + -less. Attested from mid-13c. as a surname. Related: Lovelessly; lovelessness.
lovelily (adv.) Look up lovelily at Dictionary.com
early 14c., from lovely + -ly (2).
loveliness (n.) Look up loveliness at Dictionary.com
mid-14c., "lovableness," from lovely + -ness.
lovelonging (n.) Look up lovelonging at Dictionary.com
c. 1300, luue langing, from love (n.) + infinitive of long (v.).
lovelorn (adj.) Look up lovelorn at Dictionary.com
also love-lorn, "pining for love," 1630s, from love (n.) + lorn. Perhaps coined by Milton.
lovely (adj.) Look up lovely at Dictionary.com
Old English luflic "affectionate, loveable;" see love (n.) + -ly (1). The modern sense of "lovable on account of beauty, attractive" is from c. 1300, "applied indiscriminately to all pleasing material objects, from a piece of plum-cake to a Gothic cathedral" [George P. Marsh, "The Origin and History of the English Language," 1862].
lovemaking (n.) Look up lovemaking at Dictionary.com
"courtship," mid-15c., from love (n.) + make. Phrase make love is attested from 1570s in the sense "pay amorous attention to;" as a euphemism for "have sex," it is attested from c. 1950.
lover (n.) Look up lover at Dictionary.com
early 13c., agent noun from love (v.). Old English had lufend for male lovers, lufestre for women. Meaning "one who has a predilection for" (a thing, concept, pursuit, etc.) is mid-14c. As a form of address to a lover, from 1911. Related: Loverly.
lovesick (adj.) Look up lovesick at Dictionary.com
also love-sick, 1520s, from love (n.) + sick (adj.).
lovesome (adj.) Look up lovesome at Dictionary.com
Old English lufsum "worthy of love," from love (v.) + -some (1). Early 13c. as "lovely," 1720 as "amorous." An old word that might be useful in its original sense. Related: Lovesomely; lovesomeness.
lovestruck (adj.) Look up lovestruck at Dictionary.com
also love-struck, by 1762, from love (n.) + struck (see strike (v.)). Love stricken is attested from 1805.
lovey Look up lovey at Dictionary.com
affectionate pet name, 1731, from love (n.) + -y (3). Extended form lovey-dovey attested from 1819 (n.), 1847 (adj.).
loving (adj.) Look up loving at Dictionary.com
Old English lufenda (see love (v.)). Loving cup is attested from 1808. Lovingkindness was Coverdale's word.
lovingly (adv.) Look up lovingly at Dictionary.com
late 14c., from loving + -ly (2).
low (n.2) Look up low at Dictionary.com
"hill," obsolete except in place names, Old English hlaw "hill, mound," especially "barrow," related to hleonian "to lean" (see lean (v.)). Compare Latin clivus "hill" from the same PIE root.
low (adj.) Look up low at Dictionary.com
"not high," late 13c., from lah (late 12c.), "not rising much, being near the base or ground" (of objects or persons); "lying on the ground or in a deep place" (late 13c.), from Old Norse lagr "low," or a similar Scandinavian source (compare Swedish låg, Danish lav), from Proto-Germanic *lega- "lying flat, low" (cognates: Old Frisian lech, Middle Dutch lage, Dutch laag "low," dialectal German läge "flat"), from PIE *legh- "to lie" (see lie (v.2)).

Meaning "humble in rank" is from c. 1200; "undignified" is from 1550s; sense of "dejected, dispirited" is attested from 1737; meaning "coarse, vulgar" is from 1759. In reference to sounds, "not loud," also "having a deep pitch," it is attested from c. 1300. Of prices, from c. 1400. In geographical usage, low refers to the part of a country near the sea-shore (c. 1300, as in Low Countries "Holland, Belgium, Luxemburg," 1540s). As an adverb c. 1200, from the adjective.
low (v.) Look up low at Dictionary.com
Old English hlowan "make a noise like a cow," from Proto-Germanic *khlo- (cognates: Middle Dutch loeyen, Dutch loeien, Old Low Franconian luon, Old High German hluojen), from imitative PIE root *kele- (2) "to shout" (see claim (v.)).
low (n.1) Look up low at Dictionary.com
sound made by cows, 1540s, from low (v.).
low (adv.) Look up low at Dictionary.com
early 13c., from low (adj.). Of voices or sounds, from c. 1300.
low key (adj.) Look up low key at Dictionary.com
also low-key, 1895, from low (adj.) + key (n.1), perhaps from the musical sense.
low-budget (adj.) Look up low-budget at Dictionary.com
1939, originally of motion pictures; from low (adj.) + budget (n.).
low-class (adj.) Look up low-class at Dictionary.com
1868, from low (adj.) + class (n.).
low-down (adj.) Look up low-down at Dictionary.com
also low down, lowdown, "vulgar," 1888, from low (adj.) + down (adv.). Earlier it meant "humble" (1540s). As a noun, 1915, from the adjective, American English.
low-grade (adj.) Look up low-grade at Dictionary.com
1867, originally in mining, with reference to ores, from low (adj.) + grade (n.).
low-life (adj.) Look up low-life at Dictionary.com
"disreputable, vulgar," 1794, from low (adj.) + life; as a noun, "coarse, no-good person" it is recorded from 1911. Also lowlife.
low-profile (adj.) Look up low-profile at Dictionary.com
1957, in reference to automobile wheels, from low (adj.) + profile (n.). General sense by 1970, American English, in reference to Nixon Administration policy of partial U.S. disengagement from burdensome commitments abroad.
lowboy (n.) Look up lowboy at Dictionary.com
"chest of drawers on short legs," 1891, a hybrid from low (adj.) + French bois "wood" (see bush).
lowbrow (n.) Look up lowbrow at Dictionary.com
also low-brow, "person who is not intellectual," 1902, from low (adj.) + brow. Said to have been coined by U.S. journalist Will Irwin (1873-1948), perhaps on the model of highbrow, which seems to be earlier. A low brow on a man as a sign of primitive qualities was common in 19c. fiction, but it also was considered a mark of classical beauty in women.
A low brow and not a very high one is considered beautiful in woman, whereas a high brow and not a low one is the stamp of manhood. ["Medical Review," June 2, 1894]
As an adjective from 1913.