heliotaxis


Also found in: Dictionary, Thesaurus, Encyclopedia.

he·li·o·tax·is

(hē'lē-ō-tak'sis),
A form of phototaxis, and perhaps of thermotaxis, in which there is a tendency to growth or movement toward (positive heliotaxis) or away from (negative heliotaxis) the sun or the sunlight.
Synonym(s): heliotropism
[helio- + G. taxis, orderly arrangement]
Farlex Partner Medical Dictionary © Farlex 2012

heliotaxis

(hē′lē-ō-tăk′sĭs)
n.
The movement of an organism in response to the light of the sun.

he′li·o·tac′tic (-tăk′tĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

heliotaxis

(hē-lē-ō-tăk′sĭs) [″ + taxis, arrangement]
A reaction in plants that causes them to respond negatively or positively to sunlight.

negative heliotaxis

A turning away from the sun.

positive heliotaxis

A turning toward the sun.
Medical Dictionary, © 2009 Farlex and Partners