noun.
In entomology, a looper, measurer, or measuring-worm; the Iarva of any geometrid moth. See measuring-worm, inchworm, looper, loopworm, and especially geometer, 3. See cuts under cankerworm and Cidaria.
the GNU version of the Collaborative International Dictionary of English
noun.
The larva of any geometrid moth, as the cankerworm; a geometer; a measuring worm.