Source : Webster's Revised Unabridged Dictionary (1913)

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.