-ic
-ic adjective suffix, "having to do with, having the nature of, being, made of, caused by, similar to" (in chemistry, indicating a higher valence than names in -ous), from Fr. -ique and directly from L. -icus, which in many cases represents Gk. -ikos "in the manner of; pertaining to." From PIE *-(i)ko, which also yielded Slavic -isku, adjectival suffix indicating origin, the source of the -sky (Rus. -skii) in many surnames.

Etymology dictionary. 2014.

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