/jee om"i trid/ , adj.
1. belonging or pertaining to the family Geometridae, comprising slender-bodied, broad-winged moths, the larvae of which are called measuring worms.
n.
2. a geometrid moth.
[ 1860-65; Geometridae, equiv. to Geometr ( a ) a genus name (see GEOMETER; so called because the larva seems to measure the ground with its looping motion) + - idae -ID 2 ]