kings-yellow

king's yellow

noun Chemistry.
See under arsenic trisulfide.
Dictionary.com Unabridged

arsenic trisulfide

noun Chemistry.
a yellow or red crystalline substance, As 2 S 3 , occurring in nature as the mineral orpiment, and used as a pigment (king's yellow) and in pyrotechnics.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Kings-yellow is always a great word to know.
So is callithumpian. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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