What is the meaning of Marmite?

A rounded cooking pot of various designs, commonly pot-bellied, with or without tripod, handles, lid etc; originally earthenware but currently more commonly of cast iron or other metals.

Alternative letter-case form of Marmite.

pot, cooking pot, marmite

meal prepared in a cooking pot

(heavy) shell

prostitute, especially one past the first youth, the "flesh pot" of the souteneur

Source: wiktionary.org