Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Opsin" Definition
noun
A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.
Source: American Heritage Dictionary
Any of various colorless proteins that in combination with retinal or a related prosthetic group form a visual pigment (as rhodopsin) in a reaction reversible by light.
Source: Merriam-Webster
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