noun
1. : a large yellow and black hairy syrphid fly ( Merodon equestris ) that resembles a small bumblebee, is native to Europe but now widespread in the U.S., and has a yellowish or whitish larva that bores in and destroys the bulbs of various plants (as narcissus, amaryllis, hyacinth) — called also greater bulb fly
2. : lesser bulb fly