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Meaning of Rocky Mountain locust

Rock'y Moun'tain lo'cust

Pronunciation: [key]
  1. a migratory locust, Melanoplus spretus, that occurs in North America, esp. the Great Plains, where swarms cause great damage to crops and other vegetation. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.