Etymology
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scotoma (n.)

(plural scotomata), 1540s, from Late Latin scotoma, from Greek skotoma "dizziness," from skotoun "to darken," from skotos "darkness" (from PIE root *skoto- "dark, shade.").

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Definitions of scotoma

scotoma (n.)
an isolated area of diminished vision within the visual field;
From wordnet.princeton.edu