Entry 2 senses · 2 variants Webster, 1913 Mandibulate · Man·dib·u·late · IPA a. n. 01 a. Provided with mandibles adapted for biting, as many insects. 1. Provided with mandibles adapted for biting, as many insects.(Zool.) 02 n. An insect having mandibles. 1. An insect having mandibles.(Zool.)