남성 또는 수컷 포유류의 음낭 속에 있는, 정자를 생성하는 타원형의 생식 기관.
Either of the two oval organs that produce sperm in men and other male mammals, typically enclosed in the scrotum.
예문:
"The doctor performed a physical examination to check for any lumps in the testicle."
"In many mammals, the testicles are located outside the body cavity to maintain a cooler temperature for sperm production."