/ Dictionary / Index S spermo-: Meaning and Definition of Find definitions for: spermo- Pronunciation: [key] a combining form of, used also with the meaning “seed,” “germ,” “semen,” in the formation of compound words: spermophyte. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spermiogenesis spermogonium Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language