Ge*om"e*trid (?), a. (Zoöl.) Pertaining or belonging to the Geometridæ.

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.