blue copperas

blue cop·per·as

B b

Definition of blue copperas words

noun blue copperas a salt, copper sulfate, CuSO 4 ⋅5H 2 O, occurring naturally as large transparent, deep-blue triclinic crystals, appearing in its anhydrous state as a white powder: used chiefly as a mordant, insecticide, fungicide, and in engraving. 1

before 1760

One of the 46% newest English words

First recorded in 1760-70

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adjective

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preposition

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determiner

exclamation

This term is known only to a narrow circle of people with rare knowledge. Only 2% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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