'Phototaxy' definitions:

Definition of 'Phototaxy'

From: GCIDE
  • Phototaxis \Pho`to*tax"is\, Phototaxy \Pho"to*tax`y\, n. [NL. phototaxis; photo- + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain alg[ae], etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed
  • positive phototaxis; if away from the light,
  • negative phototaxis. -- {Pho`to*tac"tic}, a. -- {Pho`to*tac"tic*al*ly}, adv. [Webster 1913 Suppl.]

Words containing 'Phototaxy'