• The fibrous, outer tunic of the eyeball that is continuous with the cornea.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• The white layer of the eye that covers most of the outside of the eyeball.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• The white of the eye; a tough, protective coating of collagen and elastic tissue that, with the cornea, makes up the outer layer of the eyeball.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• The white, opaque, fibrous, outer tunic of the eyeball, covering it entirely excepting the segment covered anteriorly by the cornea. It is essentially avascular but contains apertures for vessels, lymphatics, and nerves. It receives the tendons of insertion of the extraocular muscles and at the corneoscleral junction contains the canal of Schlemm. (From Cline et al., Dictionary of Visual Science, 4th ed)
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Tough white outer coat of the eyeball, continuous anteriorly with the cornea and posteriorly with the external sheath of the optic nerve.
  CRISP Thesaurus
  National Institutes of Health, 2006