| NOUN | substance | visual purple, rhodopsin, retinal purple | a red photopigment in the retinal rods of vertebrates |
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| Meaning | A red photopigment in the retinal rods of vertebrates; dissociates into retinene by light. | |
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| Synonyms | rhodopsin, retinal purple | |
| Part of | rod, rod cell, retinal rod | A visual receptor cell that is sensitive to dim light |
| Broader | photopigment | A special pigment found in the rods and cones of the retina |
| Substances | opsin | retinal protein formed by the action of light on rhodopsin |
| retinene, retinal | Either of two yellow to red retinal pigments formed from rhodopsin by the action of light | |