Caro's acid

Caro's acid

[kahr-ohz]
noun Chemistry.
persulfuric acid ( def 1 ).

Origin:
named after Heinrich Caro (1834–1910), German chemist

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Caro's acid (ˈkærəʊz, ˈkɑː-) [Click for IPA pronunciation guide]
 
n
another name for peroxysulphuric acid
 
[C19: named after Heinrich Caro (died 1910), German chemist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Caro's acid is always a great word to know.
So is quincunx. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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