noun
genital area; private parts
A formal, clinical term for the external genital region. In everyday conversation, more colloquial expressions are often used.
医師は陰部の診察を行った。
The doctor examined the genital area.
陰部のかゆみが気になる。
I'm concerned about itching in the genital area.
性器 refers specifically to the reproductive organs (genitals), while 陰部 is a broader term for the entire genital and pubic region.
Compound of 陰 (いん, 'yin; hidden; private') and 部 (ぶ, 'part; region'), literally 'hidden/private part'. The exact historical derivation is uncertain, but the kanji combination is conventionally associated with the anatomical meaning.