What does the word penumbra mean?

Usage examples for penumbra

  1. She brought Ross in quite casually; yet- What is the mystery of the telltale penumbra round the written word? – The Second Generation by 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 by Sir Arthur Thomas Quiller-Couch
  3. This is but the penumbra of the eclipse. – The Story of Evolution by Joseph McCabe