Two oval-shaped male reproductive organs that produce sperm and testosterone, located in the scrotum outside the body cavity to maintain optimal temperature for sperm production.
From Latin testis meaning 'witness,' possibly because these organs 'testify' to masculinity, or from an ancient practice where men would swear oaths while holding their genitals as a sign of truthfulness.
Your testes hang outside your body because sperm production requires a temperature about 2-3 degrees cooler than your core body temperature - evolution literally moved these organs outside to create a natural cooling system! This is why tight clothing, hot baths, and laptops on your lap can temporarily reduce sperm count by overheating this delicate process.
Complete word intelligence in one call. Free tier — 50 lookups/day.