noun
: either of two slimy green larval sawflies that feed on the parenchyma of and skeletonize the leaves of rosebushes:
a. : the bristly whitish green larva of a sawfly ( Cladius isomerus ) — called also bristly rose slug
b. : the velvety yellowish green larva of a sawfly ( Endelomyia aethiops ) that is native to Europe but now common in the eastern and central United States