man·dib·u·late I. \manˈdibyələ̇t, -yəˌlāt, usu -d.+V\adjective Etymology:mandibul- + -ate 1. a.: having mandibles < mandibulate insects > b.of a vertebrate: having a lower jaw 2.[New Latin Mandibulata]: of or relating to the Mandibulata II. \-yəˌlāt\noun (-s) : a mandibulate animal; especially: one of the Mandibulata