Part of speech: noun

A luminous cloud like object in the sky.

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Usage examples "nebula":

  1. Clearly, looking to what has been said in the last two sections, that from the time when the process of evolution first began,- from the time before the condensation of the nebula had showed any signs of commencing,- every subsequent change or event of evolution was necessarily bound to ensue; else force and matter have not been persistent. - "A Candid Examination of Theism", George John Romanes.
  2. The vapor continued to expand and spread until it looked like a miniature nebula. - "Jack of No Trades", Charles Cottrell.
  3. The cluster Praesepe in Cancer is visible on a clear night to the unaided eye as a small nebula. - "The Astronomy of Milton's 'Paradise Lost'", Thomas Orchard.