Etymology
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UHF

1937, abbreviation of ultra-high frequency (1932) in reference to radio frequencies in the range of 300 to 3,000 megahertz.

updated on June 18, 2012

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Definitions of UHF from WordNet

uhf (n.)
300 to 3000 megahertz;
Synonyms: ultrahigh frequency
From wordnet.princeton.edu, not affiliated with etymonline.