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Spanworm :: Spanworm (n.) The larva of any geometrid moth, as the cankeworm; a geometer; a measuring worm..

Geometrid :: Geometrid (n.) One of numerous genera and species of moths, of the family Geometridae; -- so called because their larvae (called loopers, measuring worms, spanworms, and inchworms) creep in a looping manner, as if measuring. Many of the species are injurious to agriculture, as the cankerworms..

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