Source : Webster's Revised Unabridged Dictionary (1913)

Drone \Drone\, n. [OE. drane a dronebee, AS. dr[=a]n; akin to
   OS. dr[=a]n, OHG. treno, G. drohne, Dan. drone, cf. Gr. ? a
   kind of wasp, dial. Gr. ? drone. Prob. named fr. the droning
   sound. See {Drone}, v. i.]
   1. (Zo["o]l.) The male of bees, esp. of the honeybee. It
      gathers no honey. See {Honeybee}.

            All with united force combine to drive The lazy
            drones from the laborious hive.       --Dryden.

   2. One who lives on the labors of others; a lazy, idle
      fellow; a sluggard.

            By living as a drone,to be an unprofitable and
            unworthy member of so noble and learned a society.
                                                  -- Burton.

   3. That which gives out a grave or monotonous tone or dull
      sound; as:
      (a) A drum. [Obs.] Halliwell.
      (b) The part of the bagpipe containing the two lowest
          tubes, which always sound the key note and the fifth.

   4. A humming or deep murmuring sound.

            The monotonous drone of the wheel.    --Longfellow.

   5. (Mus.) A monotonous bass, as in a pastoral composition.

Drone \Drone\, v. i. [imp. & p. p. {Droned}; p. pr. & vb. n.
   {Droning}.] [Cf. (for sense 1) D. dreunen, G. dr["o]hnen,
   Icel. drynja to roar, drynr a roaring, Sw. dr["o]na to
   bellow, drone, Dan. dr["o]ne, Goth. drunjus sound, Gr. ?
   dirge, ? to cry aloud, Skr. dhran to sound. Cf. {Drone}, n.]
   1. To utter or make a low, dull, monotonous, humming or
      murmuring sound.

            Where the beetle wheels his droning flight. --T.
                                                  Gray.

   2. To love in idleness; to do nothing. ``Race of droning
      kings.'' --Dryden.

Source : WordNet®

drone
     v 1: make a monotonous low dull sound; "The harmonium was droning
          on"
     2: talk in a monotonous voice [syn: {drone on}]

drone
     n 1: stingless male bee in a colony of social bees (especially
          honeybees) whose sole function is to mate with the queen
     2: an unchanging intonation [syn: {monotone}, {droning}]
     3: someone who takes more time than necessary; someone who lags
        behind [syn: {dawdler}, {laggard}, {lagger}, {trailer}]
     4: an aircraft without a pilot that is operated by remote
        control [syn: {pilotless aircraft}, {radio-controlled
        aircraft}]
     5: a pipe of the bagpipe that is tuned to produce a single
        continuous tone [syn: {drone pipe}, {bourdon}]