Retina Definition

rĕtn-ə
retinae, retinas
noun
The innermost coat lining the interior of the eyeball, containing various layers of photoreceptive cells that are directly connected to the brain by means of the optic nerve.
Webster's New World

Other Word Forms of Retina

Noun

Singular:
retina
Plural:
retinae

Origin of Retina

  • From Medieval Latin retina, the diminutive form of Latin rete (“net"), probably from the Vulgar Latin phrase (tunica) *retina, literally "net-like tunic", used to describe the blood vessel system at the back of the eye. (Gerard of Cremona may have created this phrase as a translation for Arabic (tabaqa) sabakiva "net-like layer", which translates Ancient Greek ἀμφιβληστροειδής (amphiblÄ“stroeidÄ“s) (χιτών (khitōn))).

    From Wiktionary

  • Middle English from Medieval Latin rētina from Latin rēte net

    From American Heritage Dictionary of the English Language, 5th Edition

Retina Sentence Examples

  • In hypermetropia the retina is in front of the principal focus of the eye.

  • One result of this among the Vertebrata is that the eyeball is pink in colour, since the cornea, iris and retina being transparent, the red blood contained in the capillaries is unmasked by the absence of pigmentary material.

  • In the retina the cones prevail in numbers over the rods, as in the mammals, and their tips contain, as in other Sauropsida, coloured drops of oil, mostly red or yellow.

  • All objects, therefore, which lie beyond a certain point (the conjugate focus of the dioptric system of the eye, the far point) are indistinctly seen; rays from them have not the necessary divergence to be focused in the retina, but may obtain it by the interposition of suitable concave lenses.

  • Thus light, pressure, or mechanical stimulation acting on the retina and optic nerve invariably produces luminous impressions.

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Words Starting With

RRERET

Words Ending With

ANAINA

Unscrambles

retina

Words Starting With R and Ending With A

Starts With R & Ends With AStarts With RE & Ends With AStarts With R & Ends With NA

Word Length

6 Letter Words6 Letter Words Starting With R6 Letter Words Ending With A