noun
Anatomical term; used in medical, biological, or formal contexts. In everyday conversation, more colloquial terms are common.
陰茎の構造について生物学の授業で学んだ。
We learned about the structure of the penis in biology class.
医師が陰茎の検査を行
The doctor performed an examination of the penis.
Compound of 陰 (in, 'hidden, yin') and 茎 (kei, 'stalk, stem'), a Sino-Japanese term for the penis. The reading いんきょう is obsolete.