bordello (n.) Look up bordello at Dictionary.com
c. 1300, bordel "house of prostitution," from Old French bordel "small hut, cabin; brothel" (12c.), diminutive of borde "hut made of planks," from Frankish *bord "wooden board" or some other Germanic source related to board (n.1). The modern form is a result of the French word being borrowed by Italian then passed back to French with a suffix and re-borrowed into English in its current form by 1590s.
border (v.) Look up border at Dictionary.com
c. 1400, "to put a border on;" 1640s as "to lie on the border of," from border (n.). Related: Bordered; bordering.
border (n.) Look up border at Dictionary.com
mid-14c., from Old French bordure "seam, edge of a shield, border," from Frankish *bord or a similar Germanic source (compare Old English bord "side;" see board (n.2)). The geopolitical sense first attested 1530s, in Scottish (replacing earlier march), from The Borders, name of the district adjoining the boundary between England and Scotland.
borderline (n.) Look up borderline at Dictionary.com
1869, "strip of land along a frontier," from border (n.) + line (n.). As an adjective meaning "verging on" it is attested from 1907, originally in medical jargon.
bore (n.) Look up bore at Dictionary.com
thing which causes ennui or annoyance, 1778; of persons by 1812; from bore (v.1).
The secret of being a bore is to tell everything. [Voltaire, "Sept Discours en Vers sur l'Homme," 1738]
bore (v.1) Look up bore at Dictionary.com
Old English borian "to bore through, perforate," from bor "auger," from Proto-Germanic *buron (source also of Old Norse bora, Swedish borra, Old High German boron, Middle Dutch boren, German bohren), from PIE root *bher- (2) "to cut with a sharp point, pierce, bore" (source also of Greek pharao "I plow," Latin forare "to bore, pierce," Old Church Slavonic barjo "to strike, fight," Albanian brime "hole").

The meaning "diameter of a tube" is first recorded 1570s; hence figurative slang full bore (1936) "at maximum speed," from notion of unchoked carburetor on an engine. Sense of "be tiresome or dull" first attested 1768, a vogue word c. 1780-81 according to Grose (1785); possibly a figurative extension of "to move forward slowly and persistently," as a boring tool does.
bore (v.2) Look up bore at Dictionary.com
past tense of bear (v.).
boreal (adj.) Look up boreal at Dictionary.com
"northern," late 15c., from Latin borealis, from boreas "north wind," from Greek Boreas, name of the god of the north wind, which is of unknown origin, perhaps related to words in Balto-Slavic for "mountain" and "forest."
borealis Look up borealis at Dictionary.com
shortening of aurora borealis (q.v.).
bored (adj.) Look up bored at Dictionary.com
1823, past participle adjective from bore (v.) in the figurative sense.
Society is now one polished horde,
Formed of two mighty tribes, the Bores and Bored.

[Byron, "Don Juan," 1823]
boredom (n.) Look up boredom at Dictionary.com
"state of being bored," 1852, from bore (v.1) + -dom. It also has been employed in a sense "bores as a class" (1883) and "practice of being a bore" (1864, a sense properly belonging to boreism, 1833).
borg (n.) Look up borg at Dictionary.com
fictional hostile alien hive-race in the "Star Trek" series, noted for "assimilating" defeated rivals, first introduced in "The Next Generation" TV series (debut fall 1987). Their catchphrase is "resistance is futile." According to the series creators, the name is derived from cyborg.
boring (adj.) Look up boring at Dictionary.com
mid-15c., "action of piercing," from bore (v.). From 1853 in reference to animals that bore; 1840 in the sense "wearying, causing ennui."
Boris Look up Boris at Dictionary.com
Slavic masc. proper name, literally "fight," from Slavic root *bor- "to fight, overcome" (see bore (v.)).
bork (v.) Look up bork at Dictionary.com
1987, "to discredit a candidate for some position by savaging his or her career and beliefs," from name of U.S. jurist Robert H. Bork (1927-2012), whose Supreme Court nomination in 1987 was rejected after an intense counter-campaign.
born Look up born at Dictionary.com
Old English boren, alternative past participle of beran (see bear (v.)). Distinction between born and borne is 17c.
born-again (adj.) Look up born-again at Dictionary.com
of Protestant Christians, by 1920, based on John iii.3. Used in figurative (non-religious) sense by 1977.
borne Look up borne at Dictionary.com
past participle of bear (v.).
Borneo Look up Borneo at Dictionary.com
large island in Indonesia, from Portuguese alteration of Brunei, which is today the name of a sultanate on the island. This is Hindi and probably ultimately from Sanskrit bhumi "land, region."
boron (n.) Look up boron at Dictionary.com
1812, from borax + ending abstracted unetymologically from carbon (it resembles carbon). Originally called boracium by Humphrey Davy because it was drawn from boracic acid. Related: Boric.
borough (n.) Look up borough at Dictionary.com
Old English burg, burh "a dwelling or dwellings within a fortified enclosure," from Proto-Germanic *burgs "hill fort, fortress" (source also of Old Frisian burg "castle," Old Norse borg "wall, castle," Old High German burg, buruc "fortified place, citadel," German Burg "castle," Gothic baurgs "city"), from PIE root *bhergh- (2) "high," with derivatives referring to hills, hill forts, fortified elevations (source also of Old English beorg "hill;" see barrow (n.2)).

In German and Old Norse, chiefly as "fortress, castle;" in Gothic, "town, civic community." Meaning shifted in Middle English from "fortress," to "fortified town," to simply "town" (especially one possessing municipal organization or sending representatives to Parliament). In U.S. (originally Pennsylvania, 1718) often an incorporated town; in Alaska, however, it is the equivalent of a county. The Scottish form is burgh. The Old English dative singular byrig survives in many place names as -bury.
borrow (v.) Look up borrow at Dictionary.com
Old English borgian "to lend, be surety for," from Proto-Germanic *borg "pledge" (source also of Old English borg "pledge, security, bail, debt," Old Norse borga "to become bail for, guarantee," Middle Dutch borghen "to protect, guarantee," Old High German boragen "to beware of," German borgen "to borrow; to lend"), from PIE root *bhergh- (1) "to hide, protect" (see bury). Sense shifted in Old English to "borrow," apparently on the notion of collateral deposited as security for something borrowed. Related: Borrowed; borrowing.
borscht (n.) Look up borscht at Dictionary.com
1884, from Russian borshch "cow parsnip," which was an original recipe ingredient. Borscht belt "region of predominantly Jewish resorts in and around the Catskill Mountains of New York" (also known as the Yiddish Alps) is by 1938.
bort (n.) Look up bort at Dictionary.com
"waste diamonds, small chips from diamond-cutting," of unknown origin, perhaps related to Old French bort "bastard."
borzoi (n.) Look up borzoi at Dictionary.com
Russian wolfhound, 1887, from Russian borzoy, literally "swift, quick" (compare Czech brzy, Serbo-Croatian brzo "quickly," Lithuanian bruzdeti "to hurry").
bose (n.) Look up bose at Dictionary.com
"to seek for hollows underground by ramming the ground and observing the vibrations," 1929, ultimately from Scottish word boss "hollow, empty" (1510s), earlier a noun meaning "small cask, wine flask" (late 14c.).
bosh (n.) Look up bosh at Dictionary.com
"empty talk, nonsense," 1834, from Turkish, literally "empty." Introduced in "Ayesha," popular romance novel by J.J. Morier (1780-1849).
Bosnia Look up Bosnia at Dictionary.com
named for the River Bosna, which is perhaps from an Indo-European root *bhog- "current." As a name or adjective for someone there, Bosnian (1788) is older in English than Bosniac (1836, from Russian Bosnyak).
bosom (n.) Look up bosom at Dictionary.com
Old English bosm "breast; womb; surface; ship's hold," from West Germanic *bosm- (source also of Old Frisian bosm, Old Saxon bosom, Middle Dutch boesem, Dutch boezem, Old High German buosam, German Busen "bosom, breast"), perhaps from PIE root *bhou- "to grow, swell," or *bhaghus "arm" (in which case the primary notion would be "enclosure formed by the breast and the arms"). Narrowed meaning "a woman's breasts" is from 1959; but bosomy "big-breasted" is from 1928. Bosom-friend is attested 1580s; bosom buddy from 1920s.
boson (n.) Look up boson at Dictionary.com
class of subatomic particles, named for Indian physicist Satyendra Nath Bose (1894-1974) + subatomic particle suffix -on.
boss (v.) Look up boss at Dictionary.com
1856, from boss (n.1). Related: Bossed; bossing.
boss (n.1) Look up boss at Dictionary.com
"overseer," 1640s, American English, from Dutch baas "a master," Middle Dutch baes, of obscure origin. If original sense was "uncle," perhaps it is related to Old High German basa "aunt," but some sources discount this theory. The Dutch form baas is attested in English from 1620s as the standard title of a Dutch ship's captain. The word's popularity in U.S. may reflect egalitarian avoidance of master (n.) as well as the need to distinguish slave from free labor. The slang adjective meaning "excellent" is recorded in 1880s, revived, apparently independently, in teen and jazz slang in 1950s.
boss (n.2) Look up boss at Dictionary.com
"protuberance, button," c. 1300, from Old French boce "a hump, swelling, tumor" (12c., Modern French bosse), from either Frankish *botija or Vulgar Latin *bottia, both of uncertain origin.
bossa nova Look up bossa nova at Dictionary.com
1962, Brazilian style of music, from Portuguese, literally "new tendency."
bossy (adj.) Look up bossy at Dictionary.com
1540s, "swelling, projecting and rounded, decorated with bosses" from boss (n.2). Meaning "domineering, fond of ordering people about" is recorded 1882, from boss (n.1) + -y (2). As a common cow name it represents Latin bos "cow" (from PIE root *gwou- "ox, bull, cow").
Boston Look up Boston at Dictionary.com
U.S. city, 1630, named for town in Lincolnshire, a region from which many settlers came to New England. The name is said to be literally "Botolph's Stone," probably from the name of some Anglo-Saxon landowner (Old English Botwulf). Boston Massacre was March 5, 1770; three civilians killed, two mortally wounded. Card game Boston (1800) is based on the siege of Boston during the American Revolution. The Boston Tea Party (1824) took place on Dec. 16, 1773 (see tea party).
bosun (n.) Look up bosun at Dictionary.com
a mid-19c. respelling to reflect the modern pronunciation of boatswain.
bot (n.) Look up bot at Dictionary.com
in internet sense, c. 2000, short for robot. Its modern use has curious affinities with earlier uses, such as "parasitical worm or maggot" (1520s), of unknown origin; and Australian-New Zealand slang "worthless, troublesome person" (World War I-era). The method of minting new slang by clipping the heads off words does not seem to be old or widespread in English. Examples (za from pizza, zels from pretzels, rents from parents) are American English student or teen slang and seem to date back no further than late 1960s.
botanic (adj.) Look up botanic at Dictionary.com
1650s, from French botanique (17c.) or directly from Medieval Latin botanicus, from Greek botanikos "of herbs," from botane "a plant, grass, pasture, fodder." The Greek words seems to have more to do with pasturage than plants; compare related botamia "pastures, meadows," boter "herdsman," boton "grazing beast."
botanical (adj.) Look up botanical at Dictionary.com
1650s, from botanic + -al. Related: Botanically.
botanist (n.) Look up botanist at Dictionary.com
1680s; see botany + -ist.
botany (n.) Look up botany at Dictionary.com
1690s, from botanic. The -y is from astronomy, etc. Botany Bay so called by Capt. Cook on account of the great variety of plants found there.
botch (v.) Look up botch at Dictionary.com
late 14c., bocchen "to repair," later, "to spoil by unskillful work" (1520s); of unknown origin. Related: Botched; botching. As a noun from c. 1600.
both (adj., pron.) Look up both at Dictionary.com
there are several theories, all similar, and deriving the word from the tendency to say "both the." One is that it is Old English begen (masc.) "both" (from Proto-Germanic *ba, from PIE *bho "both") + extended base. Another traces it to the Proto-Germanic formula represented in Old English by ba þa "both these," from ba (feminine nominative and accusative of begen) + þa, nominative and accusative plural of se "that." A third traces it to Old Norse baðir "both," from *bai thaiz "both the," from Proto-Germanic *thaiz, third person plural pronoun. Compare similar formation in Old Frisian bethe, Dutch beide, Old High German beide, German beide, Gothic bajoþs.
bother (v.) Look up bother at Dictionary.com
1718, probably from Anglo-Irish pother, because its earliest use was by Irish writers Sheridan, Swift, Sterne. Perhaps from Irish bodhairim "I deafen." Related: Bothered; bothering. As a noun from 1803.
botheration (n.) Look up botheration at Dictionary.com
1797, noun of action from bother (v.).
bothersome (adj.) Look up bothersome at Dictionary.com
1817, from bother + -some (1).
botony (n.) Look up botony at Dictionary.com
1570s, in heraldry, from Old French botoné (Modern French boutonné) "covered with buds," past participle of boutonner "to bud," from bouton "bud, button," 12c., from Frankish or some other Germanic source.
Botox Look up Botox at Dictionary.com
a commercial name for botulinum toxin, and composed of elements from those words, approved in U.S. as a temporary cosmetic injection in 2002.
botryo- Look up botryo- at Dictionary.com
before vowels botry-, word-forming element meaning "cluster, cluster-like," from Greek botrys "cluster of grapes," which is of unknown origin.