Etymology
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Words related to anomaly

an- (1)

privative prefix, from Greek an-, "not, without" (from PIE root *ne- "not"). The Greek prefix is a fuller form of the one represented in English by a- (3).

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*sem- (1)

Proto-Indo-European root meaning "one; as one, together with."

It forms all or part of: anomalous; anomaly; assemble; assimilate; ensemble; facsimile; fulsome; hamadryad; haplo-; haploid; hendeca-; hendiadys; henotheism; hetero-; heterodox; heterosexual; homeo-; homeopathy; homeostasis; homily; homo- (1) "same, the same, equal, like;" homogenous; homoiousian; homologous; homonym; homophone; homosexual; hyphen; resemble; same; samizdat; samovar; samsara; sangha; Sanskrit; seem; seemly; semper-; sempiternal; similar; simple; simplex; simplicity; simulacrum; simulate; simulation; simultaneous; single; singlet; singular; some; -some (1); -some (2); verisimilitude.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sam "together," samah "even, level, similar, identical;" Avestan hama "similar, the same;" Greek hama "together with, at the same time," homos "one and the same," homios "like, resembling," homalos "even;" Latin similis "like;" Old Irish samail "likeness;" Old Church Slavonic samu "himself."

abnormal (adj.)
Origin and meaning of abnormal

"not conformed or conforming to rule, deviating from a type or standard, contrary to system or law, irregular, unnatural," 1835, a refashioning of anormal (q.v.) under influence of Latin abnormalis "deviating from a fixed rule, irregular," from ab "off, away from" (see ab-) + norma "rule" (see norm).

The older form was from French anormal (13c.), from Medieval Latin anormalus, an altered (by association with norma) borrowing of 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"). Compare anomaly. "Few words show such a series of pseudo-etymological perversions" [Weekley]. Another adjective was abnormous (1742) "irregular, misshapen," from Latin abnormis. Related: Abnormally.

anomalo- 
word-forming element meaning "deviating from the usual, abnormal," from Greek anomalos "uneven, irregular" (see anomaly).
anormal (adj.)

"not according to rule, abnormal," 1812, from French anormal, from Medieval Latin anormalus, a corruption of anomalus (from Greek anomalos "uneven, irregular;" see anomaly), as if from Latin ab "away" + norma "rule, pattern." In 20c., it was used as "an antonym of 'normal' when the association of 'abnormal', i.e. 'unhealthy', 'unnatural', would be inappropriate" [OED].