/ Dictionary / Index S spermatozoon: Meaning and Definition of Find definitions for: sper•ma•to•zo•on Pronunciation: (spûr"mu-tu-zō'un, -on, spûr-mat"u-), [key] — pl. -zo•a one of the minute, usually actively motile gametes in semen, which serve to fertilize the ovum; a mature male reproductive cell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spermatozoon (Thesaurus) spermatozoid sperm bank Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language