terahertz
noun
tera·hertz
ˈter-ə-ˌhərts
-ˌherts
plural terahertz
: a unit of frequency equal to one trillion hertz
Visible light occupies the neighborhood of 300 terahertz, which is 300 x 1012 cycles per second.—Dave Doody
Terahertz waves also occupy a unique window of the electromagnetic spectrum where a large number of molecules emit and absorb radiation.—Michael C. Wanke et al.
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Merriam-Webster unabridged
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