One of the mysteries of the English language finally explained.
A mineral that is a sulphate of magnesium and potassium, K₂Mg(SO₄)₂·6H₂O, crystallizing in the monoclinic system and usually occurring as colourless or white masses and crusts.
Mid 19th century; earliest use found in Henry Watts (1815–1884), chemist. From picro- + ancient Greek μεριδ-, μερίς part, after Italian Picromeride.
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