Part of speech: noun

A margin of a shadow observed in an eclipse, etc.

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Usage examples "penumbra":

  1. She brought Ross in quite casually; yet- What is the mystery of the telltale penumbra round the written word? - "The Second Generation", David Graham Phillips.
  2. Overhead rode the stars; around him in the penumbra of the lantern's rays the crowd pressed forward timidly. - "The Mayor of Troy", Sir Arthur Thomas Quiller-Couch.
  3. This is but the penumbra of the eclipse. - "The Story of Evolution", Joseph McCabe.