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photo finish
photo messaging
photo-offset
photo opportunity
photo story
photoactinic
photoactive
photoautotroph
photobiology
photobiotic
photoblastic
photocall
photocatalysis
photocathode
photocell
photochemical
photochemical smog
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photobiology
pho·to·bi·ol·o·gy [ ftō bī ólləjee ]


noun 
Definition:
 
study of energy and organisms: a branch of biology concerned with the interaction of living organisms with light

pho·to·bi·o·log·i·cal [ ftō bī ə lójjik'l ] adjective
pho·to·bi·ol·o·gist [ ftō bī ólləjist ] noun
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