/ Dictionary / Index P primary sex characteristic: Meaning and Definition of Find definitions for: pri'mary sex' characteris"tic Pronunciation: [key] — Anat. Anat. any of the body structures directly concerned in reproduction, as the testes, ovaries, and external genitalia. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. primary school primary spermatocyte Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language