helio-tactic

heliotaxis

[hee-lee-oh-tak-sis]
noun Biology.
movement of an organism toward or away from sunlight.

Origin:
1895–1900; helio- + -taxis

heliotactic [hee-lee-oh-tak-tik] , adjective
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World English Dictionary
heliotaxis (ˌhiːlɪəʊˈtæksɪs)
 
n
movement of an entire organism in response to the stimulus of sunlight
 
heliotactic
 
adj

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