from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The continuous line or surface including all the points in space reached by a wave or vibration at the same instant as it travels through a medium.

from the GNU version of the Collaborative International Dictionary of English

  • n. the surface of initial displacement of the particles in a medium, as a wave of vibration advances.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium
  • n. all the points just reached by a wave as it propagates


Sorry, no etymologies found.


  • The explosion's main wave front would indeed be well past the asteroid by now, but there would also be slower but still dangerous debris expanding outward behind that front.



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