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photopigment
photopigment n. 
/ˈfəʊtə(ʊ)ˌpɪɡm(ə)nt/, /ˈfoʊdoʊˌpɪɡmənt/ Biology a pigment (e.g. in the eye) which is chemically responsive to light.
Brit. /ˌfəʊtə(ʊ)ˈpɪɡm(ə)nt/
, /ˌfəʊtə(ʊ)ˈpɪɡm(ə)nt//ˈfəʊtə(ʊ)ˌpɪɡm(ə)nt/U.S. /ˌfoʊdoʊˈpɪɡmənt/
, /ˌfoʊdoʊˈpɪɡmənt//ˈfoʊdoʊˌpɪɡmənt/ΘΚΠ
the world > life > biology > substance > pigment > [noun] > human or animal pigments > others
urohaematin1863
respiratory pigment1877
stercobilin1880
oxyluciferin1919
wear-and tear-pigment1928
photopigment1937
porphyropsin1937
erythrolabe1958
cryptochrome1978
1937 Nature 25 Sept. 545/2 The familiar Purkinje effect, for which clearly the extracted photo-pigments form an adequate chemical basis.
1964 S. Duke-Elder Parsons' Dis. Eye (ed. 14) xxiv. 364 It [sc. colour blindness] is an inherited condition,..and is probably due to the absence of one of the two photopigments normally found in the foveal cones.
2000 Red Herring Dec. 352/2 Most people are trichromats, with retinas having three kinds of color sensors, called cone photopigments—those for red, green, and blue.
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