alfalfa caterpillar

noun

Definition of alfalfa caterpillar 

: the green larva of the alfalfa butterfly that feeds on the foliage of alfalfa through most of North America and is especially abundant and destructive in the southwestern U.S.

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First Known Use of alfalfa caterpillar

1911, in the meaning defined above

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The first known use of alfalfa caterpillar was in 1911

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