Definition of woolly adelgid
: either of two aphids (genus Adelges) with a white woolly coating that have been accidentally introduced into North America: a : one (A. piceae) native to Europe that is a serious pest of fir trees b : one (A. tsugae) native to Asia that is a serious pest of hemlocks
Origin of woolly adelgid
adelgid ultimately from New Latin Adelges, probably irregular from Greek adēlos unseen
First Known Use: 1987
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