amphitrocha
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Amphitrocha — Am*phit ro*cha ([a^]m*f[i^]t r[ o]k[.a]), n. [NL., fr. Gr. amfi + trocho s a wheel.] (Zo[ o]l.) A kind of annelid larva having both a dorsal and a ventral circle of special cilia. [1913 Webster] … The Collaborative International Dictionary of English