photopathicadj.
/ˌfəʊtə(ʊ)ˈpaθɪk/, U.S. /ˌfoʊdəˈpæθɪk/ Biology. Now rare.
Of the nature of or exhibiting photopathy: (originally) responding to light levels by movement; (in later use) avoiding or intolerant of bright light.
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the world > life > biology > biological processes > movement > movement in response to stimuli > [adjective] > response to light
phototactic1882
phototropic1883
photophilous1890
photopathic1897
photophil1897
heliotactic1898
photokinetic1900
photophilic1900
1897 C. B. Davenport Exper. Morphol. i. 185 A phototactic or photopathic response has not hitherto been certainly observed in this group.
1899 Amer. Naturalist 33 978 Simocephalus moved into regions of greater intensity of light, i.e., was positively photopathic.
1901 Amer. Naturalist 35 933 Crayfish which live in deeper water become strongly photopathic and can endure only very weak light.
1904 Philos. Trans. (Royal Soc.) B. 196 347 The supposed photopathic response of Entomostraca also requires revision from this point of view.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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