资料来源 : Webster's Revised Unabridged Dictionary (1913)

Mesotrochal \Mes"o*tro`chal\, a. [Meso- + Gr. ? anything round,
   a hoop.] (Zo["o]l.)
   Having the middle of the body surrounded by bands of cilia;
   -- said of the larv[ae] of certain marine annelids.