/ Dictionary / Index W whosis: Meaning and Definition of Find definitions for: who•sis Pronunciation: (h'zis), [key] — n. whoosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. whosever whoso Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language