The Collaborative International Dictionary
Retinal purple
Retinal \Ret"i*nal\, a. (Anat.) Of or pertaining to the retina.
Retinal purple (Physiol. Chem.), the visual purple.
WordNet
retinal purple
n. a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light [syn: visual purple, rhodopsin]
Usage examples of "retinal purple".
Richard squinted his eyes, and turned his head away from the glare, all vicious orange and retinal purple.