natron

noun
na·​tron | \ˈnā-ˌträn, -trən\

Definition of natron 

: a hydrous native sodium carbonate used in ancient times in embalming, in ceramic pastes, and as a cleansing agent

First Known Use of natron

1684, in the meaning defined above

History and Etymology for natron

French, from Spanish natrón, from Arabic naṭrūn, from Greek nitron — more at niter

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The first known use of natron was in 1684

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