noun
male genitalia; penis
Medical or formal term for the male external reproductive organs; can refer to the penis specifically or the entire genital area.
男性器の構造について学ぶ。
Learn about the structure of the male genitalia.
医師が男性器の検査を行った。
The doctor performed an examination of the male genital organs.
Specifically the penis; more anatomical and clinical than 男性器, which can be broader.
Compound of 男性 (dansei, 'male') + 器 (ki, 'organ'). A straightforward modern medical term.