preputium
/priːˈpjuːʃɪəm/ /priːˈpjuːtɪəm/(also praeputium)
noun
Zoology. In certain gastropod molluscs: the terminal portion of the male genital duct, leading inwards from the male genital pore.
Origin
Late Middle English (in an earlier sense). From classical Latin praepūtium foreskin (in post-classical Latin also prepucium) from prae- + a second element of unknown origin + -ium.