entomology (n.) Look up entomology at Dictionary.com
1766, from French entomologie (1764), coined from Greek entomon "insect" + -logia "study of" (see -logy). Entomon is neuter of entomos "having a notch or cut (at the waist)," from en "in" (see en- (2)) + temnein "to cut" (see tome).

So called by Aristotle in reference to the segmented division of insect bodies. Compare insect. Related: Entomological. Hybrid insectology (1766, from French insectologie, 1744) is not much used.
I have given the name insectology to that part of natural history which has insects for its object; that of entomology ... would undoubtedly have been more suitable ... but its barbarous sound terryfy'd me. [Charles Bonnet's English translation of his "Contemplation de la nature," 1766]
entourage (n.) Look up entourage at Dictionary.com
1832, "surroundings, environment," picked up by De Quincey from French entourage, from Middle French entourer "to surround" (16c.), from Old French entour "that which surrounds" (10c.), from en- "in" (see en- (1)) + tour "a circuit" (see tour). Sense of "attendant persons" first recorded in English by 1860.
entrails (n.) Look up entrails at Dictionary.com
c.1300, from Old French entrailles (12c.), from Late Latin intralia "inward parts, intestines" (8c.), from Latin interanea, neuter plural of interaneus "internal, that which is within," from inter "between, among" (see inter-).
entrain (v.) Look up entrain at Dictionary.com
"to draw along," 1560s, from French entrainer (12c.), from en- "away" (see en- (1)) + trainer "to drag" (see train (n.)). Related: Entrained; entrainment. A word in chemistry; the word meaning "to get on a locomotive train" is a native formation from the 1860s.
entrammel (v.) Look up entrammel at Dictionary.com
1590s, from en- (1) + trammel.
entrance (n.) Look up entrance at Dictionary.com
1520s, "act of entering," from Middle French entrance, from entrer (see enter). Sense of "door, gate" first recorded in English 1530s.
entrance (v.) Look up entrance at Dictionary.com
"to throw into a trance," 1590s, from en- (1) "put in" + trance (n.). Meaning "to delight" also is 1590s. Related: Entranced; entrancing.
entrant (n.) Look up entrant at Dictionary.com
1630s, of professions, etc.; 1838, of contests; from French entrant, present participle of entrer (see enter).
entrap (v.) Look up entrap at Dictionary.com
1530s, intrappe, from Old French entraper "trap, catch in a trap;" see en- (1) + trap (v.). Related: Entrapped; entrapping.
entrapment (n.) Look up entrapment at Dictionary.com
1590s, from entrap + -ment. Criminal investigation sense first attested 1899.
entre nous Look up entre nous at Dictionary.com
"in private," French, literally "between ourselves."
entre- Look up entre- at Dictionary.com
in words from French, corresponds to English enter-, which is itself from French entre "between, among," from Latin inter (see inter-).
entreat (v.) Look up entreat at Dictionary.com
mid-14c., "to enter into negotiations;" early 15c., "to treat (someone) in a certain way," also "to plead for (someone)," from Anglo-French entretier, Old French entraiter "to treat," from en- "make" (see en- (1)) + traiter "to treat" (see treat (v.)). Meaning "to beseech, implore" is first attested c.1500. Related: Entreated; entreating.
entreaty (n.) Look up entreaty at Dictionary.com
mid-15c., "treatment, negotiation;" see entreat + -y (1). Meaning "earnest request" is from 1570s. Related: Entreaties.
entree (n.) Look up entree at Dictionary.com
1724, "opening piece of an opera or ballet," from French entrée, from Old French entree (see entry). Cookery sense is from 1759; originally the dish which was introductory to the main course. The word had been borrowed in Middle English as entre "act of entering."
entrench (v.) Look up entrench at Dictionary.com
1550s, implied in intrenched, from en- (1) "make, put in" + trench. Figurative use is from 1590s. Related: Entrenched; entrenching.
entrenchment (n.) Look up entrenchment at Dictionary.com
1580s, from entrench + -ment.
entrepot (n.) Look up entrepot at Dictionary.com
"warehouse," 1758, from French entrepôt (16c.), from Latin interpositum "that which is placed between," neuter past participle of interponere (see interposition).
entrepreneur (n.) Look up entrepreneur at Dictionary.com
1828, "manager or promoter of a theatrical production," reborrowing of French entrepreneur "one who undertakes or manages," agent noun from Old French entreprendre "undertake" (see enterprise). The word first crossed the Channel late 15c. but did not stay. Meaning "business manager" is from 1852. Related: Entrepreneurship.
entrepreneurial (adj.) Look up entrepreneurial at Dictionary.com
1922, from entrepreneur + -al (1).
entropy (n.) Look up entropy at Dictionary.com
1868, from German Entropie "measure of the disorder of a system," coined 1865 (on analogy of Energie) by German physicist Rudolph Clausius (1822-1888) from Greek entropia "a turning toward," from en "in" (see en- (2)) + trope "a turning" (see trope). Related: Entropic.
entrust (v.) Look up entrust at Dictionary.com
c.1600, from en- (1) "make, put in" + trust (v.). Related: Entrusted; entrusting.
entry (n.) Look up entry at Dictionary.com
c.1300, "act or fact of physically entering; place of entrance, means of entering a building; opportunity or right of entering; initiation or beginning of an action;" from Old French entree "entry, entrance" (12c.), noun use of fem. past participle of entrer "to enter" (see enter). Meaning "that which is entered or set down (in a book, list, etc.)" is from c.1500.
entryway (n.) Look up entryway at Dictionary.com
1746, from entry + way.
entwine (v.) Look up entwine at Dictionary.com
also intwine, 1590s, from en- (1) "make, put in" + twine (n.). Related: Entwined; entwining.
enucleation (n.) Look up enucleation at Dictionary.com
1640s, noun of action from verb enucleate (1540s), from Latin enucleatus "pure, clean," past participle of enucleare "to lay open, explain in detail," literally "to remove the kernel from" (see ex- + nucleus). Mostly figurative in Latin (the notion is of getting at the "core" of some matter), and usually figurative in English until mid-19c. advances in science and medicine gave it a new literal sense.
enumerate (v.) Look up enumerate at Dictionary.com
1640s, from or modeled on Latin enumeratus, past participle of enumerare (see enumeration). Middle English had annumerate (early 15c.). Related: Enumerated; enumerating; enumerable.
enumeration (n.) Look up enumeration at Dictionary.com
1550s, "action of enumerating," from Middle French énumération, from Latin enumerationem (nominative enumeratio) "a counting up," noun of action from past participle stem of enumerare "to reckon up, count over, enumerate," from assimilated form of ex- "from" (see ex-) + numerare "to count, number," from numerus "number" (see number (n.)). Meaning "a list, catalogue" is from 1724.
enunciate (v.) Look up enunciate at Dictionary.com
1620s, "declare, express," from Latin enunciatus, properly enuntiatus, past participle of enuntiare "speak out, say, express, assert; divulge, disclose, reveal, betray," from assimilated form of ex- "out" (see ex-) + nuntiare "to announce" (see nuncio). Or perhaps a back-formation from enunciation. Meaning "to articulate, pronounce" is from 1759. Related: Enunciated; enunciating.
enunciation (n.) Look up enunciation at Dictionary.com
1550s, "a declaration," from Latin enuntiationem (nominative enuntiatio) "enunciation, declaration," noun of action from past participle stem of enuntiare "to speak out, say, express" (see enunciate). Meaning "articulation of words" is from 1750.
enunciative (adj.) Look up enunciative at Dictionary.com
"declarative, declaring something as true," 1530s, from Latin enunciatus, properly enuntiativus, from past participle stem of enuntiare "to speak out, say, express" (see enunciate).
enuresis (n.) Look up enuresis at Dictionary.com
minor urinary incontinence, 1800, medical Latin, from Greek enourein "to urinate in," from en "in" (see en- (2)) + ourein "to urinate," from ouron (see urine).
envelop (v.) Look up envelop at Dictionary.com
late 14c., envolupen, "be involved" (in sin, crime, etc.), from Old French envoleper "envelop, cover; fold up, wrap up" (10c., Modern French envelopper), from en- "in" (see en- (1)) + voloper "wrap up," of uncertain origin, perhaps Celtic (see Gamillscheg, Diez) or Germanic ("Century Dictionary"). Literal sense is from 1580s. Related: Enveloped; enveloping.
envelope (n.) Look up envelope at Dictionary.com
"a wrapper, an enclosing cover," specifically a prepared wrapper for a letter or other paper, 1705, from French enveloppe (13c.), a back-formation from envelopper "to envelop" (see envelop).
envelopment (n.) Look up envelopment at Dictionary.com
1751, from envelop (v.) + -ment.
envenom (v.) Look up envenom at Dictionary.com
c.1300, envenymen, from Old French envenimer (12c.) "to poison, taint;" from en- (see en- (1)) + venim (see venom). Figurative use is from late 14c. Related: Envenomed; envenoming.
enviable (adj.) Look up enviable at Dictionary.com
c.1600, from envy + -able or from French enviable. Related: Enviably.
envious (adj.) Look up envious at Dictionary.com
c.1300, from Anglo-French envious, Old French envieus (13c.), earlier envidius "envious, jealous" (12c., Modern French envieux), from Latin invidiosus "full of envy" (source of Spanish envidioso, Italian invidioso, Portuguese invejoso), from invidia (see envy). Related: Enviously; enviousness.
environ (v.) Look up environ at Dictionary.com
late 14c. (implied in environing), "to surround, encircle, encompass," from Old French environer "to surround, enclose, encircle," from environ "round about," from en- "in" (see en- (1)) + viron "a circle, circuit," also used as an adverb, from virer "to turn" (see veer). Related: Environed.
environment (n.) Look up environment at Dictionary.com
c.1600, "state of being environed" (see environ + -ment); sense of "the aggregate of the conditions in which a person or thing lives" first recorded 1827 (used by Carlyle to render German Umgebung); specialized ecology sense first recorded 1956.
environmental (adj.) Look up environmental at Dictionary.com
1887, "environing, surrounding," from environment + -al (1). Ecological sense by 1967. Related: Environmentally (1884).
environmentalism (n.) Look up environmentalism at Dictionary.com
1923, as a psychological theory (in the nature vs. nurture debate), from environmental + -ism. The ecological sense is from 1972. Related: Environmentalist (n.), 1916 in the psychological sense, 1970 in the ecological sense.
environs (n.) Look up environs at Dictionary.com
"outskirts," 1660s, from French environs, plural of Old French environ "compass, circuit," from environ (adv.) "around, round about" (see environ).
envisage (v.) Look up envisage at Dictionary.com
1778, from French envisager "look in the face of," from en- "cause to" (see en- (1)) + visage "face" (see visage). Related: Envisaged; envisaging.
envision (v.) Look up envision at Dictionary.com
1914, from en- (1) "make, put in" + vision. Related: Envisioned; envisioning. Earlier (1827) is envision'd in sense "endowed with vision."
envoy (n.) Look up envoy at Dictionary.com
"messenger," 1660s, from French envoyé "messenger," literally "one sent" (12c.), noun use of past participle of envoyer "send," from Vulgar Latin *inviare "send on one's way," from Latin in "on" (see in- (2)) + via "road" (see via (adv.)). The same French word was borrowed in Middle English to mean "a stanza of a poem sending it off to find readers" (late 14c.).
envy (n.) Look up envy at Dictionary.com
late 13c., from Old French envie "envy, jealousy, rivalry" (10c.), from Latin invidia "envy, jealousy," from invidus "envious," from invidere "envy," earlier "look at (with malice), cast an evil eye upon," from in- "upon" (see in- (2)) + videre "to see" (see vision).

Similar formations in Avestan nipashnaka "envious," also "look at;" Old Church Slavonic zavideti "to envy," from videti "to see;" Lithuanian pavydeti "to envy," related to veizdeti "to see, to look at."
envy (v.) Look up envy at Dictionary.com
late 14c., from Old French envier, from envie (see envy (n.)). Related: Envied; envying.
enwind (v.) Look up enwind at Dictionary.com
1590s (implied in inwinding), from en- (1) + wind (v.). Related: Enwound; enwinding.
enwrap (v.) Look up enwrap at Dictionary.com
late 14c., from en- (1) "make, put in" + wrap (v.). Related: Enwrapped; enwrapping.