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photic (adj.)

1843, "pertaining to light;" 1899, "pertaining to the parts of the ocean penetrated by sunlight," from Greek phot-, combining form of phōs "light" (related to phainein "to show, to bring to light," from PIE root *bha- (1) "to shine") + -ic. Photics "the science of light" is attested by 1858.

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Definitions of photic from WordNet

photic (adj.)
of or relating to or caused by light;
From wordnet.princeton.edu