ultrapure

[uhl-truh-pyoo r]

adjective

extremely pure, especially without impurities: ultrapure silicon for semiconductors.

Origin of ultrapure

First recorded in 1960–65; ultra- + pure
Related formsul·tra·pure·ly, adverbul·tra·pu·ri·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019