Optogram

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Optogram \Op"to*gram\, n. [Optic + -gram: cf. F. optogramme.]
     (Physiol.)
     An image of external objects fixed on the retina by the
     photochemical action of light on the visual purple. See
     {Optography}.
     [1913 Webster]