Source : Webster's Revised Unabridged Dictionary (1913)

Dope \Dope\, v. t.
   1. To treat or affect with dope; as, to dope nitroglycerin;
      specif.:
      (a) To give stupefying drugs to; to drug. [Slang]
      (b) To administer a stimulant to (a horse) to increase his
          speed. It is a serious offense against the laws of
          racing. [Race-track Slang]

   2. To judge or guess; to predict the result of, as by the aid
      of dope. [Slang]

Dope \Dope\ (d[=o]p), n. [D. doop a dipping, fr. doopen to dip.
   Cf. {Dip}.]
   1. Any thick liquid or pasty preparation, as of opium for
      medicinal purposes, of grease for a lubricant, etc.

   2. Any preparation, as of opium, used to stupefy or, in the
      case of a race horse, to stimulate. [Slang or Cant]

   3. An absorbent material; esp., in high explosives, the
      sawdust, infusorial earth, mica, etc., mixed with
      nitroglycerin to make a damp powder (dynamite, etc.) less
      dangerous to transport, and ordinarily explosive only by
      suitable fulminating caps.

   4. Information concerning the previous performances of race
      horses, or other facts concerning them which may be of
      assistance in judging of their chances of winning future
      races; sometimes, similar information concerning other
      sports. [Sporting Slang]

Source : WordNet®

dope
     n 1: street names for marijuana [syn: {pot}, {grass}, {green
          goddess}, {weed}, {gage}, {sess}, {sens}, {smoke}, {skunk},
           {locoweed}, {Mary Jane}]
     2: an ignorant or foolish person [syn: {dumbbell}, {dummy}, {boob},
         {booby}, {pinhead}]
     3: carbonated drink flavored with extract from Kola nuts
        (`dope' is a southernism in the United States) [syn: {cola}]
     4: slang terms for inside information; "is that the straight
        dope?" [syn: {poop}, {the skinny}, {low-down}]

dope
     v 1: take drugs to improve one's athletic performance
     2: add impurities to (a semiconductor) in order to produce or
        modify its properties; "The resistors have been doped"
     3: give a narcotic to; "The athletes were dope by the coach
        before the race" [syn: {dope up}]