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Wordnet Dictionary
Adjective retinal has 1 sense
  1. retinal - in or relating to the retina of the eye; "retinal cells"
,Noun retinal has 1 sense
  1. retinene, retinal - either of two yellow to red retinal pigments formed from Rhodopsin by the action of light
    --1 is a kind of pigment
    --1 is a substance of visual purple, rhodopsin, retinal purple
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