Online Etymology Dictionary

anecdote (n.): 1670s, "secret or private stories," from French anecdote (17c.) or directly from Greek anekdota "things unpublished," neuter plural of anekdotos, from an- "not" (see an-) + ekdotos "published," from ek- "out" + didonai "to give" (see date (1)).

Procopius' 6c. Anecdota, unpublished memoirs of Emperor Justinian full of court gossip, gave the word a sense of "revelation of secrets," which decayed in English to "brief, amusing stories" (1761).
anechoic (adj.): 1948, in electronics, from an- (1) "not" + echoic.
anemia (n.): alternative (chiefly U.S.) spelling of anaemia (q.v.). See ae. As a genus of plants, Modern Latin, from Greek aneimon "unclad," from privative prefix an- (see an- (1)) + eima "a dress, garment" (see wear (v.)).
anemic (adj.): alternative (chiefly U.S.) spelling of anaemic (q.v.). See ae.
anemo-: before vowels anem-, word-forming element meaning "wind," from comb. form of Greek anemos (see anemone).
anemometer (n.): 1727, from anemo- "wind" + -meter.
anemone (n.): flowering plant genus, 1550s, from Middle French anemone (16c.) and directly from Latin anemone, from Greek anemone "wind flower," literally "daughter of the wind," from anemos "wind" (cognate with Latin anima; see animus) + -one feminine patronymic suffix. Klein suggests the flower name perhaps originally is from Hebrew (cf. na'aman, in nit'e na'amanim, literally "plants of pleasantness," in Is. xvii:10, from na'em "was pleasant"). Applied to a type of sea creature (sea anemone) from 1773.
anencephalic (adj.): "having no brain" (biology), 1839, from Greek anenkephalos, from privative prefix an- (see an- (1)) + enkephalos "brain" (see encephalitis) + -ic.
anent (prep.): "concerning, about," early 13c., onont "on level with," also "in the company of, fronting against," from Old English on efn "near to, close by," originally "on even (ground) with;" the parasitic -t added 12c. A northern form (in Midlands, anenst, with adverbial genitive), affected by English writers in Scottish sense of "in respect or reference to." Cf. German neben "near to, by the side of," short for in eben, from Old High German ebani "equality."
anesthesia (n.): alternative spelling of anaesthesia (q.v.). See ae.
anesthesiologist (n.): alternative spelling of anaesthesiologist (q.v.). See ae.
anesthesiology (n.): alternative spelling of anaesthesiology (q.v.). See ae.
anesthetic (adj.): alternative spelling of anaesthetic (q.v.). See ae.
anesthetist (n.): alternative spelling of anaesthetist (q.v.). See ae.
anesthetize (v.): alternative spelling of anaesthetize (q.v.). See ae.
aneuploidy (n.): abnormal number of chromosomes, 1934, from aneuploid (1931), Modern Latin, coined 1922 by G. Täckholm from an- (1) "not" + euploid, from Greek eu- "well, good" (see eu-) + -ploid, from ploos "fold" + -oid.
aneurism (n.): the less correct, but more popular, spelling of aneurysm (q.v.), by influence of words in -ism. The -y- is etymologically correct; the spelling with -i- suggests a meaning "nervelessness."
aneurysm (n.): early 15c., from Medieval Latin aneurisma, from Greek aneurysmos "dilation," from aneurynein "to dilate," from ana- "up" (see ana-) + eurynein "widen," from eurys "broad, wide," from PIE root *were- "wide, broad" (cf. Sanskrit uruh "broad, wide").
anew (adv.): c.1300, a neue, from Old English of-niowe; see a- (1) + new. One-word form dominant from c.1400.
anext (adv.): "next to," c.1400, from a- (1) + next.
anfractuous (adj.) $Look up anfractuous at Dictionary.com$: "full of windings and turnings," 1620s, from Latin anfractuous, from anfractus "a winding, a turning, bending round," from am(bi)- "around" (see ambi-) + fractus, past participle of frangere "to break" (see fraction). Related: Anfractuosity.
angel (n.): 14c. fusion of Old English engel (with hard -g-) and Old French angele, both from Latin angelus, from Greek angelos "messenger, envoy, one that announces," possibly related to angaros "mounted courier," both from an unknown Oriental word (Watkins compares Sanskrit ajira- "swift;" Klein suggests Semitic sources). Used in Scriptural translations for Hebrew mal'akh (yehowah) "messenger (of Jehovah)," from base l-'-k "to send." An Old English word for it was aerendgast, literally "errand-spirit."

Of persons, "loving; lovely," by 1590s. The medieval gold coin (a new issue of the noble, first struck 1465 by Edward VI) was so called for the image of archangel Michael slaying the dragon, which was stamped on it. It was the coin given to patients who had been "touched" for the King's Evil. Angel food cake is from 1881; angel dust "phencyclidine" is from 1968.
Angela: fem. proper name, Latin fem. of angelus "angel" (see angel).
Angeleno (n.): "resident or native of Los Angeles," 1888, from American Spanish Angeleño, from (Los) Angeles + -eño, suffix indicating a native or resident. See Los Angeles.
angelfish (n.): also angel-fish, 1660s, from angel + fish (n.); so called for its "wings."
angelic (adj.): late 15c., "pertaining to angels," from Old French angelique "angelic" (Modern French angélique (13c.), from Latin angelicus, from Greek angelikos "angelic," from angelos (see angel). Meaning "angel-like" is from late 14c.; sense of "wonderfully pure, sweet" is recorded from early 16c. Related: Angelically.
Angelica: fem. proper name, Latin fem. of angelicus "angelic" (see angel).
Angelina: fem. proper name, diminutive of Angela.
angelolatry (n.): "worship of angels," 1847, from angel + -latry.
anger (v.): c.1200, "to irritate, annoy, provoke," from Old Norse angra "to grieve, vex, distress; to be vexed at, take offense with," from Proto-Germanic *angus (cf. Old English enge "narrow, painful," Middle Dutch enghe, Gothic aggwus "narrow"), from PIE root *angh- "tight, painfully constricted, painful" (cf. Sanskrit amhu- "narrow," amhah "anguish;" Armenian anjuk "narrow;" Lithuanian ankstas "narrow;" Greek ankhein "to squeeze," ankhone "a strangling;" Latin angere "to throttle, torment;" Old Irish cum-ang "straitness, want"). In Middle English, also of physical pain. Meaning "excite to wrath, make angry" is from late 14c. Related: Angered; angering.
anger (n.): mid-13c., "distress, suffering; anguish, agony," also "hostile attitude, ill will, surliness," from Old Norse angr "distress, grief. sorrow, affliction," from the same root as anger (v.). Sense of "rage, wrath" is early 14c. Old Norse also had angr-gapi "rash, foolish person;" angr-lauss "free from care;" angr-lyndi "sadness, low spirits."
Angevin: 1650s, "pertaining to the French province of Anjou," from French Angevin, from Medieval Latin Andegavinus, from Andegavum "Angers," city in France, capital of Anjou (Latin Andegavia, from Andecavi, Roman name of the Gaulish people who lived here, of unknown origin). In English history, of the Plantagenet kings (beginning with Henry II) who were descended from Geoffrey, count of Anjou, and Matilda, daughter of Henry I.
angina (n.): 1570s, from Latin angina "infection of the throat," from Greek ankhone "a strangling" (see anger); probably influenced in Latin by angere "to throttle." Angina pectoris is from 1744, from Latin pectoris, genitive of pectus "chest" (see pectoral (adj.)).
angio-: before verbs angi-, word-forming element now usually meaning "covered or enclosed by a seed or blood vessel," from Latinized form of Greek angeion "a vessel, receptacle," diminutive of angos "chest, box," of unknown origin.
angiogenesis (n.): 1896, from angio- + genesis.
angiogram (n.): 1933, from angio- + -gram.
angiography (n.): 1731, from angio- + -graphy.
angioma (n.): 1867, medical Latin, from angio- + -oma.
angioplasty (n.): by 1976, from angio- + -plasty.
angiosperm (n.): 1853, from Modern Latin Angiospermae, coined 1690 by German botanist Paul Hermann (1646-1695), from Greek angeion "vessel" (see angio-) + spermos, adjective from sperma "seed" (see sperm). So called because the seeds in this class of plants are enclosed.
angle (v.1): "to fish with a hook," mid-15c., from Old English angel (n.) "angle, hook, fishhook," related to anga "hook," from PIE *ang-/*ank- "to bend" (see angle (n.)). Cf. Old English angul, Old Norse öngull, Old High German angul, German Angel "fishhook." Figurative sense is recorded from 1580s.
It is but a sory lyfe and an yuell to stand anglynge all day to catche a fewe fisshes. [John Palsgrave, 1530]
Related: Angled; angling.
angle (n.): "space between intersecting lines," late 14c., from Old French angle "angle, corner," and directly from Latin angulus "an angle, corner," a diminutive form from PIE root *ang-/*ank- "to bend" (cf. Greek ankylos "bent, crooked," Latin ang(u)ere "to compress in a bend, fold, strangle;" Old Church Slavonic aglu "corner;" Lithuanian anka "loop;" Sanskrit ankah "hook, bent," angam "limb;" Old English ancleo "ankle;" Old High German ango "hook"). Angle bracket is 1875 in carpentry; 1956 in typography.
Angle: member of a Teutonic tribe, Old English, from Latin Angli "the Angles," literally "people of Angul" (Old Norse Öngull), a region in what is now Holstein, said to be so-called for its hook-like shape (see angle (n.)). People from the tribe there founded the kingdoms of Mercia, Northumbia, and East Anglia in 5c. Britain. Their name, rather than that of the Saxons or Jutes, may have become the common one for the whole group of Germanic tribes because their dialect was the first committed to writing.
angle (v.2): "to move at an angle, to move diagonally or obliquely," 1741, from angle (n.). Related: Angled; angling.
angler (n.): "fisher with a hook and line," mid-15c. (c.1300 as a surname); agent noun from angle (v.1).
Anglian: "of the Angles," 1726; see Angle. The Old English word was Englisc, but as this came to be used in reference to the whole Germanic people of Britain, a new word was wanted to describe this one branch of them.
Anglican (adj.): 1630s, "of the reformed Church of England" (opposed to Roman), from Medieval Latin Anglicanus, from Anglicus "of the English people, of England" (see anglicize). The noun meaning "adherent of the reformed Church of England" is first recorded 1797.
Anglicism (n.): 1640s, "anglicized language," from Latin Anglicus "of the English" (see Angle) + -ism. As an instance of this, from 1781.
Anglicization (n.): 1836, noun of action from anglicize; earlier in same sense were Anglification (1867), from Anglify (1751).
anglicize (v.): 1710, with -ize + Medieval Latin Anglicus "of the English," from Angli "the Angles" (see Angle). Related: Anglicized; anglicizing.