n. Any of various caterpillars, mostly of the family Pyralidae, that spin a web.
the GNU version of the Collaborative International Dictionary of English
n. Any one of various species of moths whose gregarious larvæ eat the leaves of trees, and construct a large web to which they retreat when not feeding.
The Century Dictionary and Cyclopedia
n. Any one of several lepidopterous larvæ which feed more or less gregariously, and spin large webs into which they retire at night, or within which they feed during the day until the contained foliage is entirely devoured, when the web is enlarged.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. several gregarious moth larvae that spin webs over foliage on which they feed
Word Usage
"The leaves are eaten by mimosa webworm in some areas of North America."