root canal ( synonym found)
Definition of root canal:

°Of or pertaining to the retina.
°One of several yellow or red carotenoid pigments formed from rhodopsin by the action of light; retinene.
Definition of root canal:

°Of or pertaining to the retina.
°One of several yellow or red carotenoid pigments formed from rhodopsin by the action of light; retinene.
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