Word Study
sawfly
CIDE DICTIONARY
sawfly, n.
Any one of numerous species of hymenopterous insects belonging to the family Tenthredinidæ . The female usually has an ovipositor containing a pair of sawlike organs with which she makes incisions in the leaves or stems of plants in which to lay the eggs. The larvæ resemble those of Lepidoptera. [1913 Webster]
OXFORD DICTIONARY
sawfly, n. (pl. -flies) any insect of the superfamily Tenthredinidae, with a serrated ovipositor, the larvae of which are injurious to plants.
For further exploring for "sawfly" in Webster Dictionary Online