Ge‐om″e‐trid, n.(Zoöl.) One of numerous genera and species of moths, of the family Geometridæ; — so called because their larvæ (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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.