/ Dictionary / Index V vasectomy: Meaning and Definition of Find definitions for: vas•ec•to•my Pronunciation: (va-sek'tu-mē), [key] — pl. -mies. excision of the vas deferens, or of a portion of it: performed to effect sterility in men. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vasectomy (Thesaurus) vase vas efferens Related Content Daily Word Quiz: persevere Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language