noun Anatomy.
a dense, white, fibrous membrane that, with the cornea, forms the external covering of the eyeball.

1885–90; < Neo-Latin < Greek sklērá (feminine) hard Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sclera (ˈsklɪərə)
Also called: sclerotic the firm white fibrous membrane that forms the outer covering of the eyeball
[C19: from New Latin, from Greek sklēros hard]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sclera scle·ra (sklēr'ə)
n. pl. scle·ras or scle·rae (sklēr'ē)
The tough fibrous tunic forming the outer envelope of the eye and covering all of the eyeball except the cornea; the white of the eye. Also called sclerotic.

scle'ral 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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American Heritage
Science Dictionary
sclera   (sklîr'ə)  Pronunciation Key 
The tough, white, fibrous tissue that covers all of the eyeball except the cornea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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