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Why is a drone called a drone?

 

There were two meanings for drone then:

a "male bee," or a "monotonous, sustained sound."

Which was the inspiration for applying the term?

The aircraft's function can clue you in:

it's an extension of the "bee" meaning.

Drones are bigger and heavier than worker bees,

and they leave the hive and swarm in the fall.

Done