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Brocken specter

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noun
  1. an optical phenomenon sometimes occurring at high altitudes when the image of an observer placed between the sun and a cloud is projected on the cloud as a greatly magnified shadow.

Origin of Brocken specter

First recorded in 1920–25; see origin at Brocken bow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018