wave-meter

wave·me·ter

[weyv-mee-ter]
noun
a device for measuring the wavelength or frequency of a radio wave.

Origin:
1900–05; wave + -meter

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Collins
World English Dictionary
wavemeter (ˈweɪvˌmiːtə) [Click for IPA pronunciation guide]
 
n
an instrument for measuring the frequency or wavelength of radio waves

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Wave-meter is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
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