Drones, as the radio-controlled craft are called, have many potentialities, civilian and military. Some day huge mother ships may guide fleets of long-distance, cargo-carrying airplanes across continents and oceans. Long-range drones armed with atomic bombs could be flown by accompanying mother ships to their targets and in for perfect hits. ["Popular Science," November, 1946]Meaning "deep, continuous humming sound" is early 16c., apparently imitative (compare threnody). The verb in the sound sense is early 16c.; it often is the characteristic sound of airplane engines. Related: Droned; droning.
[ drone 造句 ]