penis pe·nis (pē'nĭs)
n. pl. pe·nis·es or pe·nes (-nēz)
The male organ of copulation and of urinary excretion, formed by three columns of erectile tissue, two arranged laterally on the dorsum and one medianly below; the extremity is formed by an expansion of the corpus spongiosum, covered by a free fold of skin.
|penis (pē'nĭs) Pronunciation Key
Plural penises or penes (pē'nēz)