long wave

noun
1.
Electricity. an electromagnetic wave over 60 meters in length.

Origin:
1830–40

long-wave, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
long wave
 
n
a.  a radio wave with a wavelength greater than 1000 metres
 b.  (as modifier): a long-wave broadcast

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for longwave
In longwave uv light it has a very strong reflection, almost white.
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