/ Dictionary / Index I involucrum: Meaning and Definition of Find definitions for: in•vo•lu•crum Pronunciation: (in"vu-l'krum), [key] — pl. -cra involucre. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. involucre involuntary Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language