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photopheresis
photophilic
photophobia
photophobic
photophore
photophoresis
photophosphorylation
photopia
photopigment
photopolymer
photopositive
photorealism
photoreception
photoreceptor
photoreconnaissance
photoresist
photorespiration
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phototaxis

pho·to·tax·is [ ftō táksiss ]


noun 
Definition:
 
movement of organism caused by light: movement of an organism either toward or away from a source of light

[Late 19th century]

pho·to·tac·tic adjective
pho·to·tac·ti·cal·ly [ ftō táktikəlee ] adverb
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