psilo-

Bare, smooth.

Greek psilos, bald.

The drugs psilocybin (Greek kubē, head) and psilocin are alkaloid hallucinogenics found in the liberty cap and related toadstools of the genus Psilocybe, named from their appearance; psilomelane (Greek melas, melan‑, black) is a hydrated oxide of manganese, which occurs in smooth black amorphous masses.