/ Dictionary / Index C crustaceous: Meaning and Definition of Find definitions for: crus•ta•ceous Pronunciation: (kru-stā'shus), [key] — adj. of the nature of or pertaining to a crust or shell. crustacean. having a hard covering or crust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crustaceous (Thesaurus) crustacean crustal Related Content Daily Word Quiz: foliage Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language