Entry 2 senses Webster, 1913 Clathrate /(klăth"rā̇t)/ · Clath·rate · IPA /ˈklæθɹeɪt/ 01 a. Shaped like a lattice; cancellate. 1. Shaped like a lattice; cancellate.(Bot.) 2. Having the surface marked with raised lines resembling a lattice, as many shells.(Zool.)