/ Dictionary / Index S sperm oil: Meaning and Definition of Find definitions for: sperm' oil" Pronunciation: [key] — Chem. Chem. a yellow, thin, water-insoluble liquid obtained from the sperm whale, used chiefly as a lubricant in light machinery, as watches, clocks, and scientific apparatus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spermogonium spermophile Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language