/ Dictionary / Index S sperm whale: Meaning and Definition of Find definitions for: sperm' whale" Pronunciation: [key] a large, square-snouted whale, Physeter catodon, valued for its oil and spermaceti: now reduced in number and rare in some areas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spermous Sperry Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language