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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*skoto- 

Proto-Indo-European root meaning "dark, shade." 

It forms all or part of: nightshade; scotoma; shade; shadow; shady.

It is the hypothetical source of/evidence for its existence is provided by: Greek skotos "darkness, gloom;" Albanian kot "darkness;" Old Irish scath, Old Welsh scod, Breton squeut "darkness," Gaelic sgath "shade, shadow, shelter;" Old English scead "partial darkness," sceadu "shade, shadow, darkness," Dutch schaduw, German Schatten, Gothic skadus "shadow." 

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