noun
corpus cavernosum penis; cavernous body of penis
Anatomical term for the erectile tissue in the penis.
陰茎海綿体は、勃起時に血液で満たされる組織です。
The corpus cavernosum penis is the tissue that fills with blood during an erection.
Compound of 陰茎 (penis) + 海綿体 (corpus cavernosum). The exact historical derivation is uncertain, but the term is a modern anatomical coinage.