noun Physics.
the region of maximum amplitude between two adjacent nodes in a standing wave.

1880–85; anti- + node

antinodal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antinode (ˈæntɪˌnəʊd)
physics See also standing wave Compare node a point at which the amplitude of one of the two kinds of displacement in a standing wave has maximum value. Generally the other kind of displacement has its minimum value at this point

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Word Origin & History

1882, from anti- + node.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
antinode   (ān'tĭ-nōd')  Pronunciation Key 
In a standing wave, the region or point of maximum amplitude between two adjacent nodes. Compare node.
The American Heritage® Science Dictionary
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