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retina - 9 dictionary results
ret⋅i⋅na
[ret-n-uh, ret-nuh] 
–noun, plural ret⋅i⋅nas, ret⋅i⋅nae [ret-n-ee] . Anatomy.
[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. |
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
1975–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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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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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Retina
Ret"i*na\, n. [NL., from L. rete a net. Cf. Reticule.] (Anat.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye. Note: The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : retina
Spanish:
retina,
German:
die Netzhaut,
Japanese:
網膜
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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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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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
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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| retina (rět'n-ə) Pronunciation Key
Plural retinas or retinae (rět'n-ē') The light-sensitive membrane that lines the inside of the back of the eyeball and connects to the brain by the optic nerve. The retina of vertebrate animals contains rods and cones, specialized cells that absorb light. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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