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2017 Word of the Year

thunder egg

noun, Geology.
1.
a globular concretion of opal, agate, or chalcedony weathered out of tuff or basalt.
Compare geode.
Origin of thunder egg
1940-1945
First recorded in 1940-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Value for thunder

11
12
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