1. geometrid - Noun
2. geometrid - Adjective
Pertaining or belonging to the Geometridae.
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.
Source: Webster's dictionary