Etymology
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Words related to an-

aniso- 
word-forming element meaning "unequal, not equal," from Greek anisos "not equal," from an- "not" (see an- (1)) + isos "equal to, the same as" (see iso-).
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anisometric (adj.)
"of unequal measurement," 1850, perhaps based on German anisometrisch (by 1836); see an- (1) "not" + isometric.
anisotropic (adj.)
"not having the same properties in all directions," 1854; see an- (1) "not" + isotropic.
anneal (v.)

Middle English anelen, from Old English onælan "to set on fire, kindle; inspire, incite," from on- "on" (see an- (1)) + ælan "to burn, bake," from Proto-Germanic *ailan, "probably" [Watkins] from the same PIE root meaning "to burn" that is the source of ash (n.1). It is related to Old English æled "fire, firebrand," Old Norse eldr, Danish ild "fire."

The -n- was doubled after c. 1600 by analogy of Latinate words (annex, etc.; compare accursed, afford, allay). Meaning "to treat by heating and gradually cooling" (of glass, earthenware, metals, etc., to toughen them) was in late Old English. Related: Annealed; annealing.

anodyne (adj.)

"having power to relieve pain," 1540s, from Medieval Latin anodynus "pain-removing, allaying pain," from Latin anodynus "painless," from Greek anodynos "free from pain," from an- "without" (see an- (1)) + odyne "pain, torment" (of the body or mind), a word of uncertain origin, evidently Indo-European, but none of the proposed etymologies satisfies Beekes. Some suggest it is a suffixed form of PIE root *ed- "to eat" (compare Lithuanian ėdžioti "to devour, bite," ėdžiotis "to suffer pain").

As a noun, "substance which alleviates pain," 1540s; in old slang, frequently a euphemism for "death" (as the final relief from the mental pain or distress of life) as in anodyne necklace "hangman's noose." Related: Anodynous.

anomalous (adj.)

"deviating from a general rule," 1640s, from Late Latin anomalus, from Greek anomalos "uneven, irregular," from an- "not" (see an- (1)) + homalos "even," from homos "same" (from PIE root *sem- (1) "one; as one, together with"). Related: Anomalously; anomalousness.

anomaly (n.)
Origin and meaning of anomaly

1570s, "unevenness;" 1660s, "deviation from the common rule," from Latin anomalia, from Greek anomalia "inequality," abstract noun from anomalos "uneven, irregular," from an- "not" (see an- (1)) + homalos "even," from homos "same" (from PIE root *sem- (1) "one; as one, together with"). From 1722 as "something abnormal or irregular."

anomphalous (adj.)
"without a navel," 1742, from Latinized compound of Greek an- "without" (see an- (1)) + omphalos "navel" (see omphalos).
anonymous (adj.)

c. 1600, "without a name;" 1670s, "published under no name, of unknown authorship," from Late Latin anonymus, from Greek anonymos "without a name," from an- "without" (see an- (1)) + onyma, Æolic dialectal form of onoma "name" (from PIE root *no-men- "name").

Anopheles (n.)

genus of mosquitoes, Modern Latin, coined 1818 by German entomologist Johann Wilhelm Meigen from Greek anopheles "hurtful, harmful," literally "useless," from an- "not, without" (see an- (1)) + ophelos "use, help, advantage," from PIE root *obhel- "to avail" (see Ophelia). So called because it conveys malaria.

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