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.