drone

US /droʊn/
UK /droʊn/
"drone" picture
1.

a remote-controlled pilotless aircraft or small flying robot, used for surveillance, delivering goods, or military operations

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The company uses drones to deliver packages.
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Military drones are used for reconnaissance.
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UAVunmanned aerial vehicleRPVremotely piloted vehicle
2.

a continuous low humming sound

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The constant drone of the air conditioner was annoying.
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We could hear the distant drone of an airplane.
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humbuzzwhirpurrmurmur
3.

a male bee, especially a honeybee, that does no work but can fertilize the queen

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The queen bee mates with several drones.
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Drones are expelled from the hive in winter.
1.

make a continuous low humming sound

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The refrigerator continued to drone in the background.
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The engines of the plane began to drone loudly.
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humbuzzwhirpurrmurmur
2.

speak in a monotonous tone

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The professor would often drone on about ancient history.
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His voice began to drone as he read the long report.
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monotonizeintonate monotonouslyspeak flatly
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drone on