Source : Webster's Revised Unabridged Dictionary (1913)

Blast \Blast\, v. t. [imp. & p. p. {Blasted}; p. pr. & vb. n.
   {Blasting}.]
   1. To injure, as by a noxious wind; to cause to wither; to
      stop or check the growth of, and prevent from
      fruit-bearing, by some pernicious influence; to blight; to
      shrivel.

            Seven thin ears, and blasted with the east wind.
                                                  --Gen. xii. 6.

   2. Hence, to affect with some sudden violence, plague,
      calamity, or blighting influence, which destroys or causes
      to fail; to visit with a curse; to curse; to ruin; as, to
      blast pride, hopes, or character.

            I'll cross it, though it blast me.    --Shak.

            Blasted with excess of light.         --T. Gray.

   3. To confound by a loud blast or din.

            Trumpeters, With brazen din blast you the city's
            ear.                                  --Shak.

   4. To rend open by any explosive agent, as gunpowder,
      dynamite, etc.; to shatter; as, to blast rocks.

Blast \Blast\ (bl[.a]st), n. [AS. bl[=ae]st a puff of wind, a
   blowing; akin to Icel. bl[=a]str, OHG. bl[=a]st, and fr. a
   verb akin to Icel. bl[=a]sa to blow, OHG. bl[^a]san, Goth.
   bl[=e]san (in comp.); all prob. from the same root as E.
   blow. See {Blow} to eject air.]
   1. A violent gust of wind.

            And see where surly Winter passes off, Far to the
            north, and calls his ruffian blasts; His blasts
            obey, and quit the howling hill.      --Thomson.

   2. A forcible stream of air from an orifice, as from a
      bellows, the mouth, etc. Hence: The continuous blowing to
      which one charge of ore or metal is subjected in a
      furnace; as, to melt so many tons of iron at a blast.

   Note: The terms hot blast and cold blast are employed to
         designate whether the current is heated or not heated
         before entering the furnace. A blast furnace is said to
         be in blast while it is in operation, and out of blast
         when not in use.

   3. The exhaust steam from and engine, driving a column of air
      out of a boiler chimney, and thus creating an intense
      draught through the fire; also, any draught produced by
      the blast.

   4. The sound made by blowing a wind instrument; strictly, the
      sound produces at one breath.

            One blast upon his bugle horn Were worth a thousand
            men.                                  --Sir W.
                                                  Scott.

            The blast of triumph o'er thy grave.  --Bryant.

   5. A sudden, pernicious effect, as if by a noxious wind,
      especially on animals and plants; a blight.

            By the blast of God they perish.      --Job iv. 9.

            Virtue preserved from fell destruction's blast.
                                                  --Shak.

   6. The act of rending, or attempting to rend, heavy masses of
      rock, earth, etc., by the explosion of gunpowder,
      dynamite, etc.; also, the charge used for this purpose.
      ``Large blasts are often used.'' --Tomlinson.

   7. A flatulent disease of sheep.

   {Blast furnace}, a furnace, usually a shaft furnace for
      smelting ores, into which air is forced by pressure.

   {Blast hole}, a hole in the bottom of a pump stock through
      which water enters.

   {Blast nozzle}, a fixed or variable orifice in the delivery
      end of a blast pipe; -- called also {blast orifice}.

   {In full blast}, in complete operation; in a state of great
      activity. See {Blast}, n., 2. [Colloq.]

Blast \Blast\, v. i.
   1. To be blighted or withered; as, the bud blasted in the
      blossom.

   2. To blow; to blow on a trumpet. [Obs.]

            Toke his blake trumpe faste And gan to puffen and to
            blaste.                               --Chaucer.

Source : WordNet®

blast
     n 1: a long and hard-hit fly ball
     2: a sudden very loud noise [syn: {bang}, {clap}, {eruption}, {loud
        noise}]
     3: a strong current of air; "the tree was bent almost double by
        the gust" [syn: {gust}, {blow}]
     4: an explosion (as of dynamite)
     5: a highly pleasurable or exciting experience; "we had a good
        time at the party"; "celebrating after the game was a
        blast" [syn: {good time}]
     6: intense adverse criticism; "Clinton directed his fire at the
        Republican Party"; "the government has come under attack";
        "don't give me any flak" [syn: {fire}, {attack}, {flak}, {flack}]

blast
     v 1: make a strident sound; "She tended to blast when speaking
          into a microphone" [syn: {blare}]
     2: hit hard; "He smashed a 3-run homer" [syn: {smash}, {nail},
        {boom}]
     3: use explosives on; "The enemy has been shelling us all day"
        [syn: {shell}]

Source : Free On-Line Dictionary of Computing

blast
     
        1. {BLT}, used especially for large data sends over a network
        or comm line.  Opposite of {snarf}.  Usage: uncommon.  The
        variant "blat" has been reported.
     
        2. [HP/Apollo] Synonymous with {nuke}.  Sometimes the message
        "Unable to kill all processes.  Blast them (y/n)?"  would
        appear in the command window upon logout.