/ Dictionary / Index T testacean: Meaning and Definition of Find definitions for: tes•ta•cean Pronunciation: (te-stā'shun), [key] — adj. Zool. having a shell or test. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: testacean (Thesaurus) testa testaceous Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language