heliotaxis

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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]

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.

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.