| iodopsin | (noun) a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | - |
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| opsin | (noun) retinal protein formed by the action of light on rhodopsin | - |
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| pepsin | (noun) an enzyme produced in the stomach that splits proteins into peptones | - |
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| rhodopsin | (noun) a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light | Synonyms: retinal purple, visual purple |
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| trypsin | (noun) an enzyme of pancreatic origin; catalyzes the hydrolysis of proteins to smaller polypeptide units | - |
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