also: せいしょっき
noun
genital organ; reproductive organ
Refers to the organs involved in reproduction; used in medical, biological, and everyday contexts.
生殖器の病気について医者に相談した。
I consulted a doctor about a disease of the reproductive organs.
生物学の授業で生殖器の構造
We learned about the structure of reproductive organs in biology class.
性器 is a more common and slightly more casual term for genitals, while 生殖器 emphasizes the reproductive function.
Compound of 生殖 (reproduction) + 器 (organ).