Hypertext Webster Gateway: "optogram"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
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