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

Heterodromous \Het`er*od"ro*mous\, a. [Hetero- + Gr. ? to run.]
   1. (Bot.) Having spirals of changing direction. --Gray.

   2. (Mech.) Moving in opposite directions; -- said of a lever,
      pulley, etc., in which the resistance and the actuating
      force are on opposite sides of the fulcrum or axis.