penis sheath

noun2

1. •
   A chiefly ceremonial item of clothing that covers the penis; sometimes only such items that do not cover the scrotum (as distinct from a phallocrypt); usually form-fitting or otherwise shaped to resemble the penis.
2. •
   The foreskin or an analogous structure into which the penis retracts.

   • The upper end of the penis sheath is in Limnodrilus ornatus furnished with a ring of star-like glands, the functions of which are not understood. — 1885