Priapus Syllabification: (Pri·a·pus)Pronunciation: /prīˈāpəs/ Greek MythologyDefinition of Priapus a god of fertility, whose cult spread to Greece (and, later, Italy) from Turkey after Alexander’s conquests. He was also a god of gardens and the patron of seafarers and shepherds. Priapus in other Oxford dictionaries Definition of Priapus in the British & World English dictionary