Bagworm Definition

Any of several moths of the family Psychidae, the larvae and females of which inhabit fibrous cases constructed of silk with bits of leaves and other debris, especially Thyridopteryx ephemeraeformis, a pest of deciduous and evergreen trees.

Any of a family (Psychidae) of moths with larvae that build cocoons shaped like bags and feed on the leaves of various trees: the wingless, legless adult females continue to live within the casing.

(proscribed) Eastern tent caterpillar.

Fall webworm.