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sylvite Definition

syl·vite (silvīt′)

noun

a white or colorless mineral, KCl, that is the chief ore of the potassium used to make fertilizers

Etymology: earlier sylvine < Fr < ModL sal digestivus sylvii, lit., digestive salt of Sylvius (after Franz de la Boë Sylvius, 1614-72, physician at Leyden)