make a continuous low humming sound

in the far distance a machine droned

a continuous low humming sound

he nodded off to the drone of the car engine

a continuous musical note of low pitch

the drone rose by a third to A

a male bee in a colony of social bees, which does no work but can fertilize a queen

a remote-controlled pilotless aircraft or small flying device

pilots use remote controls to guide a stealth reconnaissance drone

a photographer used a drone to take some unconventional photos of the countryside