Source : Webster's Revised Unabridged Dictionary (1913)

Thief \Thief\ (th[=e]f), n.; pl. {Thieves} (th[=e]vz). [OE.
   thef, theef, AS. [thorn]e['o]f; akin to OFries. thiaf, OS.
   theof, thiof, D. dief, G. dieb, OHG. diob, Icel.
   [thorn]j[=o]fr, Sw. tjuf, Dan. tyv, Goth. [thorn]iufs,
   [thorn]iubs, and perhaps to Lith. tupeti to squat or crouch
   down. Cf. {Theft}.]
   1. One who steals; one who commits theft or larceny. See
      {Theft}.

            There came a privy thief, men clepeth death.
                                                  --Chaucer.

            Where thieves break through and steal. --Matt. vi.
                                                  19.

   2. A waster in the snuff of a candle. --Bp. Hall.

   {Thief catcher}. Same as {Thief taker}.

   {Thief leader}, one who leads or takes away a thief.
      --L'Estrange.

   {Thief taker}, one whose business is to find and capture
      thieves and bring them to justice.

   {Thief tube}, a tube for withdrawing a sample of a liquid
      from a cask.

   {Thieves' vinegar}, a kind of aromatic vinegar for the sick
      room, taking its name from the story that thieves, by
      using it, were enabled to plunder, with impunity to
      health, in the great plague at London. [Eng.]

   Syn: Robber; pilferer.

   Usage: {Thief}, {Robber}. A thief takes our property by
          stealth; a robber attacks us openly, and strips us by
          main force.

                Take heed, have open eye, for thieves do foot by
                night.                            --Shak.

                Some roving robber calling to his fellows.
                                                  --Milton.