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Definition of LOOPER
: any of the usually rather small hairless caterpillars that are mostly larvae of moths (families Geometridae and Noctuidae) and move with a looping motion in which the hind prolegs draw the posterior body toward the front followed by forward extension by the anterior legs —called also inchworm
Larva of any member of a large, widespread group (mostly in the family Geometridae, with some in the family Noctuidae) of moths. Loopers move in a characteristic inching or looping gait by extending the front part of the body and bringing the rear up to meet it. Resembling twigs or leaf stems, they feed on foliage, and can seriously damage or destroy trees.