What is the meaning of Cantharus?

A large drinking cup with two handles.

A fountain or basin in the courtyard of an ancient church for worshippers to wash before entering.

a large drinking vessel with handles hanging down, tankard

a kind of sea-fish, possibly the black seabream (Spondyliosoma cantharus)

a lug of a water-pipe in the form of a tankard

Source: wiktionary.org