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crookesite

[krook-sahyt]

noun

a rare mineral, selenide of copper, thallium, and silver, (Cu, Tl, Ag)₂Se, occurring in steel-gray, compact masses.

Origin:
1865–70; after Sir W. Crookes; see -ite¹

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Crookesite is always a great word to know.

So is flibbertigibbet. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a chattering or flighty, light-headed person.

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