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beryllonite

[buh-ril-uh-nahyt]

noun

a mineral, sodium beryllium phosphate, NaBePO₄, occurring in colorless or light-yellow crystals, sometimes used as a gemstone.

Origin:
1885–90; < Greek bērýll(i)on (bḗryll(os) beryl + -ion diminutive suffix) + -ite¹

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

So is callithumpian. Does it mean:

a gadget; dingus; thingumbob.

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

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