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an- (2)[an- 词源字典]: form of Latin ad- before -n- (see ad-).[an- etymology, an- origin, 英语词源]
ana-: before verbs an-, prefix meaning 1. "upward," 2. "back, backward, against," 3. "again, anew," from Greek ana- "up to, toward, exceedingly, back, against," from ana "up, on, upon, throughout, again," cognate with Old English on, from PIE root *ano- "on, upon, above" (see on).
anabaptism (n.): 1640s (as a Christian doctrine, with capital A-, from 1570s), from Medieval Latin anabaptismus, from Late Greek anabaptismos, from ana- "up (in place or time), back again, anew" (see ana-) + baptismos "baptism" (see baptism).
Anabaptist (n.): 1530s, "one who baptizes over again," from Modern Latin anabaptista, from Latin anabaptismus "second baptism" (used in literal sense from 4c.; see anabaptism).

Originally in English in reference to sect that practiced adult baptism and arose in Germany 1521. Probably so called because, as a new faith, they baptized converts who already had been baptized (as infants) in the older Christian churches. Modern branches only baptize once (adults) and do not actively seek converts. The name also was applied, usually opprobriously, to Baptists, perhaps due to the multiple immersions of their baptisms.
anabasis (n.): 1706, from Greek, "military expedition," literally "a going up (from the coast)," especially in reference to the advance of Cyrus the Younger from near the Aegean coast into Asia, and the subsequent story of the retreat of the 10,000 narrated by Xenophon (401 B.C.E.), from anabainein "to go up, mount;" from ana "up" (see ana-) + bainein "to go" (see come).
anabolic (adj.): "pertaining to the process of building up (especially in metabolism)," 1876, from Greek anabole "that which is thrown up; a mound," from anaballein "to throw or toss up," from ana "up, upward" (see ana-) + ballein "to throw" (see ballistics).
anabolism (n.): 1886; see anabolic + -ism.
anachronism (n.): 1640s, "an error in computing time or finding dates," from Latin anachronismus, from Greek anakhronismos, from anakhronizein "refer to wrong time," from ana- "against" (see ana-) + khronos "time" (see chrono-). Meaning "something out of harmony with the present" first recorded 1816.
anachronistic (adj.): 1775; see anachronism + -istic.
anacoluthon (n.): "want of grammatical sequence; changing constructions in mid-clause," 1706, from Latinized form of Greek anakoluthon, neuter of anakolouthos "inconsequent," from an- "not" (see an- (1)) + akolouthos "following," from copulative prefix a- + keleuthos "way, road, track, path" (see celerity).
anaconda (n.): 1768, a name first used in English to name a Ceylonese python, it was applied erroneously to a large South American boa, called in Brazil sucuriuba. The word is of uncertain origin, and no snake name like it now is found in Sinhalese or Tamil. One suggestion is that it is a Latinization of Sinhalese henacandaya "whip snake," literally "lightning-stem" [Barnhart]. Another suggestion is that it represents Tamil anaikkonda "having killed an elephant" [OED].
Anacreontic (adj.): of or in the manner of Anacreon, "convivial bard of Greece" (literally "Up-lord"), the celebrated Greek lyrical poet (560-478 B.C.E.), born at Teos in Ionia. Also in reference to his lyric form (1706) of a four-line stanza, rhymed alternately, each line with four beats (three trochees and a long syllable), also "convivial and amatory" (1801); and "an erotic poem celebrating love and wine" (1650s).

Francis Scott Key in 1814 set or wrote his poem "The Star-Spangled Banner" to the melody of "To Anacreon in Heav'n," the drinking song of the popular London gentleman's club called The Anacreontic Society, whose membership was dedicated to "wit, harmony, and the god of wine." The tune is late 18c. and may be the work of society member and court musician John Stafford Smith (1750-1836).
anacrusis (n.): "unstressed syllable at the beginning of a verse," 1833, Latinized from Greek anakrousis "a pushing back," of a ship, "backing water," from anakrouein "to push back, stop short, check," from ana- "back" (see ana-) + krouein "to strike," from PIE *kreue- (2) "to push, strike" (cognates: Russian krusit, Lithuanian krusu "to smash, shatter," Old Church Slavonic kruchu "piece, bit of food," Old English hreowian "feel pain or sorrow," Old Norse hryggja "make sad").
anadiplosis (n.): "repetition of an initial word," 1580s, from Latin, from Greek anadiplosis, from anadiploesthai "to be doubled back, to be made double," from ana "back" (see ana-) + diploun "to double, fold over" (see diploma).
anadromous (adj.): of fish, "ascending a river to spawn" (as salmon do), 1753, from Latinized form of Greek anadromos "running upward," from ana "up, back" (see ana-) + dramein "to run" (see dromedary).
anaemia (n.): 1824, from French medical term (1761), Modern Latin, from Greek anaimia "lack of blood," from anaimos "bloodless," from an- "without" (see an- (1)) + haima "blood" (see -emia).
anaemic (adj.): c. 1840; see anaemia + -ic. Figurative sense by 1898.
anaerobic (adj.): "capable of living without oxygen," 1879 (as anaerobian; modern form first attested 1884), from French anaérobie, coined 1863 by French bacteriologist Louis Pasteur (1822-1895), from Greek an- "without" (see an- (1)) + aer "air" (see air (n.1)) + bios "life" (see bio-).
anaesthesia (n.): 1721, "loss of feeling," Modern Latin, from Greek anaisthesia "want of feeling, lack of sensation (to pleasure or pain)," from an- "without" (see an- (1)) + aisthesis "feeling," from PIE root *au- "to perceive" (see audience). As "a procedure for the prevention of pain in surgical operations," from 1846.
anaesthesiologist (n.): 1943, American English, from anaesthesiology + -ist.