Meaning of tropotaxis

trop•o•tax•is

Pronunciation: (trop"u-tak'sis, trō"pu-), [key]
— n. Zool.
  1. straight movement by an organism toward or away from a source of stimulation as a result of comparing information received by paired sensory receptors on both sides of the body. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.