a suffix of adjectives (and in the plural, of nouns from adjectives) formed from nouns ending in -ist and having reference to such nouns, or to associated nouns in -ism (deistic; euphuistic; puristic). In nouns, it usually has a plural form (linguistics). Cf. -ist, -ic, -ics.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.