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retina

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ret⋅i⋅na

  [ret-n-uh, ret-nuh]
Use retina in a Sentence
–noun, plural ret⋅i⋅nas, ret⋅i⋅nae  [ret-n-ee] . Anatomy.
the innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light.

Origin:
1350–1400; ME ret(h)ina < ML rētina, perh. equiv. to L rēt- (s. of rēte) net + -ina -ine 1
Retinal diseases
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retina
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Ret⋅in-A

  [ret-n-ey]
Trademark. a brand of tretinoin, used esp. to reduce wrinkles caused by overexposure to the sun.
Origin:
1975–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To retina
ret·i·na   (rět'n-ə)   
n.   pl. ret·i·nas or ret·i·nae (rět'n-ē')
A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.

[Middle English, from Medieval Latin rētina, from Latin rēte, net.]
ret'i·nal adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

retina [(ret-n-uh)]

The inner layer of the eye, sensitive to light, that is connected to the brain by the optic nerve. The retina lines the rear of the eye-ball. The lens of the eye focuses waves of light on the retina.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

retina 
1392, from M.L. retina, probably from V.L. (tunica) *retina, lit. "net-like tunic," on resemblance to the network of blood vessels at the back of the eye, and ult. from L. rete "net." The V.L. phrase may be Gerard of Cremona's 12c. translation of Ar. (tabaqa) sabakiva "netlike layer," itself a translation of Gk. amphiblestroeides (khiton).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: ret·i·na
Pronunciation: 'ret-&n-&, 'ret-n&
Function: noun
Inflected Form: plural retinas or ret·i·nae /-&n-"E/
: the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layersincluding one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals whichreach the brain by way of the optic nerve

Main Entry: Ret·in–A
Pronunciation: "ret-&n-'A
Function: trademark
—used for a preparation of tretinoin
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

retina ret·i·na (rět'n-ə)
n. pl. ret·i·nas or ret·i·nae (rět'n-ē')
The delicate multilayered light-sensitive membrane lining the inner posterior chamber of the eyeball containing the rods and cones and connected by the optic nerve to the brain.

ret'i·nal adj.

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