/ Dictionary / Index C crustose: Meaning and Definition of Find definitions for: crus•tose Pronunciation: (krus'tōs), [key] — adj. Bot., Mycol. forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens. Cf. foliose, fruticose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crustose (Thesaurus) crusted crusty Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language