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nebula definition

nebu·la (neb′yə lə)

noun pl. nebulae -·lae′ (-lē′) or nebulas -·las

  1. a cloud of interstellar gas or dust: formerly, applied to any hazy, distant celestial object, as a star cluster or an external galaxy
  2. Med.
    1. a small, cloudy opacity on the cornea
    2. a liquid preparation used as a spray

Etymology: ModL < L, vapor, fog, mist < IE base *nebh-, moist, vapor, cloud > Gr nephos, nephelē, cloud, OE nifol, mist, darkness

Related Forms:

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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