Web"form`\, n. (Zo["o]l.) Any one of various species of moths whose gregarious larv[ae] eat the leaves of trees, and construct a large web to which they retreat when not feeding.

Note: The most destructive webworms belong to the family Bombycid[ae], as the fall webworm (Hyphantria textor), which feeds on various fruit and forest trees, and the common tent caterpillar, which feeds on various fruit trees (see Tent caterpillar, under Tent.) The grapevine webworm is the larva of a geometrid moth (see Vine inchworm, under Vine).
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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