What is the meaning of Drone fly?

A dipterous insect (Eristalis tenax), resembling the drone bee. See Eristalis.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). drone fly. Retrieved September 20, 2026, from http://smartdefine.org/drone_fly/definitions/2000657
ChicagoWebster's. 2011. "drone fly" http://smartdefine.org/drone_fly/definitions/2000657 (accessed September 20, 2026).
HarvardWebster's 2011, drone fly, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/drone_fly/definitions/2000657>.
MLAWebster's. "drone fly" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/drone_fly/definitions/2000657>