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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An imaginary surface passing through points of a medium oscillating in phase.

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


Sorry, no etymologies found.



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