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[skleer-uh] /ˈsklɪər ə/
noun, Anatomy.
a dense, white, fibrous membrane that, with the cornea, forms the external covering of the eyeball.
Origin of sclera
1885-90; < New Latin < Greek sklērá (feminine) hard Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for sclera
Historical Examples
  • In acute glaucoma the sclera appears to be edematous and slightly thickened.

    Glaucoma Various
  • As the disease progresses the sclera becomes denser than normal.

    Glaucoma Various
  • This permits the sclera to show through a very little at this part.

    Glaucoma Various
  • The eyes may remain open for such long periods of time that the conjunctiva and sclera may become quite dry and ulcerate.

    Benign Stupors August Hoch
  • In the stage of degeneration, ectasae of the sclera occur most frequently near the equator of the globe.

    Glaucoma Various
  • The displacement backward of the lamina cribrosa may cause that structure to lie behind the outer surface of the sclera.

    Glaucoma Various
  • If the iris lies in contact with the sclera and cornea for some time, it becomes adherent (peripheral anterior synechia).

    Glaucoma Various
British Dictionary definitions for sclera


the firm white fibrous membrane that forms the outer covering of the eyeball Also called sclerotic
Word Origin
C19: from New Latin, from Greek sklēros hard
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sclera

1886, medical Latin, from Greek sklera (menix) "the hard (membrane)," fem. of skleros "hard" (see sclerosis).

Online Etymology Dictionary, © 2010 Douglas Harper
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sclera in Medicine

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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sclera in Science
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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