Definition of eggar
: any of various moths of the family Lasiocampidae (as many members of the genera Eriogaster and Lasiocampa) that have nonfunctional mouthparts as adults and plumose antennae in the males and produce larvae that feed on the foliage of trees
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Origin and Etymology of eggar
eggar alteration of egger; egger from 2egg + -er; from the shape of the cocoon
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