Dictionary.com
Thesaurus.com

primary sex characteristic

American  

noun

Anatomy.

  1. any of the body structures directly concerned in reproduction, as the testes, ovaries, and external genitalia.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.