ultrapure

adjective
ul·​tra·​pure | \ ˌəl-trə-ˈpyu̇r How to pronounce ultrapure (audio) \

Definition of ultrapure

: extremely pure ultrapure metals/crystals especially : extremely clean and free from contaminants such as dirt or bacteria ultrapure water

First Known Use of ultrapure

1818, in the meaning defined above

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The first known use of ultrapure was in 1818

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