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suffix meaning "pertaining to, similar to": allelic, cadaveric, hypochondriac.
-ac[L. -acus, Gr. -akos, adj. suffix]
1. A variant of the suffix -ic, used with Greek nouns whose stems end in -i, e, g., cardiac, from cardi- and maniac, from mani-.
2. In pharmacology, a suffix designating an anti-inflammatory drug derived from acetic acid.