Source : Webster's Revised Unabridged Dictionary (1913)

Dust \Dust\, n. [AS. dust; cf. LG. dust, D. duist meal dust, OD.
   doest, donst, and G. dunst vapor, OHG. tunist, dunist, a
   blowing, wind, Icel. dust dust, Dan. dyst mill dust; perh.
   akin to L. fumus smoke, E. fume. ?.]
   1. Fine, dry particles of earth or other matter, so
      comminuted that they may be raised and wafted by the wind;
      that which is crumbled too minute portions; fine powder;
      as, clouds of dust; bone dust.

            Dust thou art, and unto dust shalt thou return.
                                                  --Gen. iii.
                                                  19.

            Stop! -- for thy tread is on an empire's dust.
                                                  --Byron.

   2. A single particle of earth or other matter. [R.] ``To
      touch a dust of England's ground.'' --Shak.

   3. The earth, as the resting place of the dead.

            For now shall sleep in the dust.      --Job vii. 21.

   4. The earthy remains of bodies once alive; the remains of
      the human body.

            And you may carve a shrine about my dust.
                                                  --Tennyson.

   5. Figuratively, a worthless thing.

            And by the merit of vile gold, dross, dust. --Shak.

   6. Figuratively, a low or mean condition.

            [God] raiseth up the poor out of the dust. --1 Sam.
                                                  ii. 8.

   7. Gold dust; hence: (Slang) Coined money; cash.

   {Down with the dust}, deposit the cash; pay down the money.
      [Slang] ``My lord, quoth the king, presently deposit your
      hundred pounds in gold, or else no going hence all the
      days of your life. . . . The Abbot down with his dust, and
      glad he escaped so, returned to Reading.'' --Fuller.

   {Dust brand} (Bot.), a fungous plant ({Ustilago Carbo}); --
      called also {smut}.

   {Gold dust}, fine particles of gold, such as are obtained in
      placer mining; -- often used as money, being transferred
      by weight.

   {In dust and ashes}. See under {Ashes}.

   {To bite the dust}. See under {Bite}, v. t.

   {To}

   {raise, or kick up, dust}, to make a commotion. [Colloq.]

   {To throw dust in one's eyes}, to mislead; to deceive.
      [Colloq.]

Dust \Dust\, v. t. [imp. & p. p. {Dusted}; p. pr. & vb. n.
   {Dusting}.]
   1. To free from dust; to brush, wipe, or sweep away dust
      from; as, to dust a table or a floor.

   2. To sprinkle with dust.

   3. To reduce to a fine powder; to levigate. --Sprat.

   {To dyst one's jacket}, to give one a flogging. [Slang.]

Source : WordNet®

dust
     v 1: remove the dust from; "dust the cabinets"
     2: rub the dust over a surface so as to blur the outlines of a
        shape; "The artist dusted the charcoal drawing down to a
        faint image"
     3: cover with a light dusting of a substance; "dust the bread
        with flour"
     4: distribute loosely; "He scattered gun powder under the
        wagon" [syn: {scatter}, {sprinkle}, {dot}, {disperse}]

dust
     n 1: fine powdery material such as dry earth or pollen that can
          be blown about in the air; "the furniture was covered
          with dust"
     2: the remains of something that has been destroyed or broken
        up [syn: {debris}, {junk}, {rubble}, {detritus}]
     3: free microscopic particles of solid material; "astronomers
        say that the empty space between planets actually contains
        measurable amounts of dust"