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x unit

From Wiktionary, the free dictionary

English

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EnglishWikipedia has an article on:
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Etymology

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AfterX-ray (x signifying the unknown).

Noun

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xunit (pluralx units)

  1. Aunit oflength (symbolxu) approximately equal to 0.1picometres, used to quote thewavelength ofX-rays andgamma rays.
    Synonym:Siegbahn unit
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