photopigment

English Thesaurus

1. a special pigment found in the rods and cones of the retina (noun.substance)

hypernym	:	pigment,
definition	:	dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.) (noun.substance)

hyponym	:	iodopsin,
definition	:	a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision (noun.substance)

hyponym	:	retinal purple, rhodopsin, visual purple,
definition	:	a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light (noun.substance)