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Rocky Mountain locust

noun
1.
a migratory locust, Melanoplus spretus, that occurs in North America, especially the Great Plains, where swarms cause great damage to crops and other vegetation.
Also called Rocky Mountain grasshopper.
Origin
1875-1880
1875-80, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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