Entry 1 sense Webster, 1913 Amphitrocha /(ăm*fĭt"rō̇kȧ)/ · Am·phit·ro·cha · IPA 01 n. A kind of annelid larva having both a dorsal and a ventral circle of special cilia. 1. A kind of annelid larva having both a dorsal and a ventral circle of special cilia.(Zool.)