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[ret-n-uh l] /ˈrɛt n əl/
of or relating to the retina of the eye.
Origin of retinal1
First recorded in 1830-40; retin(a) + -al1


[ret-n-al, -awl] /ˈrɛt nˌæl, -ˌɔl/
noun, Biochemistry.
an orange pigment, C 2 0 H 2 8 O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.
Also, retinene
[ret-n-een] /ˈrɛt nˌin/ (Show IPA)
First recorded in 1940-45; retin(a) + -al3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for retinal
Contemporary Examples
Historical Examples
  • “Not my province, Commander,” Nariaki said as he pulled the retinal photos out of the machine.

    Unwise Child Gordon Randall Garrett
  • “Such as fingerprint and retinal patterns,” said Lieutenant Nariaki.

    Unwise Child Gordon Randall Garrett
  • These similarities went even further, the very abnormalities of retinal response finding their reflection in the inorganic.

  • Mike the Angel put his face in the rest for the retinal photos.

    Unwise Child Gordon Randall Garrett
  • A light-sensitive liquid (visual purple) and cellular and fibrous layers complete the retinal structure.

    Visual Illusions Matthew Luckiesh
  • retinal pattern 490-BJ4-67—which is also the code that is supposed to get me through your blockade.

    Planet of the Damned Harry Harrison
  • This is a retinal defect, the affected being able to see only in strong illumination.

    The Social Direction of Evolution William E. Kellicott
  • This is generally accounted for by fatigue of the retinal process.

    Visual Illusions Matthew Luckiesh
  • The cells, which are hidden by this pigment, were described by me in 1890 as the retinal end-cells with large nuclei.

    The Origin of Vertebrates Walter Holbrook Gaskell
Word Origin and History for retinal

1838; see retina + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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retinal in Medicine

retinal ret·i·nal (rět'n-āl', -ôl')
See retinaldehyde.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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