Definition of sawfly
: any of numerous hymenopterous insects (superfamily Tenthredinoidea and especially family Tenthredinidae) with the female usually having a sawlike ovipositor and with the larva resembling a plant-feeding caterpillar
First Known Use of sawfly
Learn More about sawfly
Britannica.com: Encyclopedia article about sawfly
Seen and Heard
What made you want to look up sawfly? Please tell us where you read or heard it (including the quote, if possible).