Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An area of diminished vision within the visual field.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an area of impaired or lost vision within a field of vision otherwise in a good (or at least healthy) state

from the GNU version of the Collaborative International Dictionary of English

  • n. Scotomy.

from The Century Dictionary and Cyclopedia

  • n. A defect in the visual field.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an isolated area of diminished vision within the visual field

Etymologies

New Latin scotōma, from Late Latin, dim sight, from Greek skotōma, dizziness, from skotoun, to darken, from skotos, darkness.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Late Latin scotoma, from Ancient Greek σκότωμα (skótōma), from σκότος (skótos, "darkness"). (Wiktionary)

Examples

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  • ...a genius if ever there was one, the possessor, together with the appalling insight, of all the scotomas and quirks of such dedicated powers...

    - Malcolm Lowry, October Ferry to Gabriola

    July 30, 2008