Dropworm

• (n.) The larva of any geometrid moth, which drops from trees by means of a thread of silk, as the cankerworm.
Found on http://thinkexist.com/dictionary/meaning/dropworm/

Dropworm

Drop'worm` (drŏp'wûrm`) noun (Zoology) The larva of any geometrid moth, which drops from trees by means of a thread of silk, as the cankerworm.
Found on http://www.encyclo.co.uk/webster/D/124
No exact match found