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heliotaxis
heliotaxis n.
Brit. 
/ˌhiːlɪə(ʊ)ˈtaksɪs/
, /ˌhiːlɪə(ʊ)ˈtaksɪs/U.S. /ˌhilioʊˈtæksəs/
phototaxis due to the rays of the sun./ˌhilioʊˈtæksəs/ΘΚΠ
the world > life > biology > biological processes > movement > movement in response to stimuli > [noun] > response to light
phototaxis1893
photopathy1897
heliotaxis1898
phototropism1899
photokinesis1905
photonegativity1921
photostability1926
photophily1934
1898 Jrnl. Royal Microsc. Soc. 422 (heading) Heliotaxis of larval mites.
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as lemmas