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ultrapure

[uhl-truh-pyoo r] /ˌʌl trəˈpyʊər/
adjective
1.
extremely pure, especially without impurities:
ultrapure silicon for semiconductors.
Origin
1960-1965
1960-65; ultra- + pure
Related forms
ultrapurely, adverb
ultrapurity, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for ultrapure
  • Semiconductor-grade silicon must be ultrapure before doping, or adding tiny amounts of impurities to change its conductivity.

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