The Collaborative International Dictionary of English v.0.48:

Dragoon \Dra*goon"\ (dr[.a]*g[=oo]n"), n. [F. dragon dragon,
   dragoon, fr. L. draco dragon, also, a cohort's standard (with
   a dragon on it). The name was given from the sense standard.
   See Dragon.]
   1. ((Mil.) Formerly, a soldier who was taught and armed to
      serve either on horseback or on foot; now, a mounted
      soldier; a cavalry man.
      [1913 Webster]

   2. A variety of pigeon. --Clarke.
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   Dragoon bird (Zool.), the umbrella bird.
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The Collaborative International Dictionary of English v.0.48:

Dragoon \Dra*goon"\, v. t. [imp. & p. p. Dragooned; p. pr. &
   vb. n. Dragooning.]
   1. To harass or reduce to subjection by dragoons; to
      persecute by abandoning a place to the rage of soldiers.
      [1913 Webster]

   2. To compel submission by violent measures; to harass; to
      persecute.
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            The colonies may be influenced to anything, but they
            can be dragooned to nothing.          --Price.
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            Lewis the Fourteenth is justly censured for trying
            to dragoon his subjects to heaven.    --Macaulay.
      [1913 Webster]

The Devil's Dictionary (1881-1906):

DRAGOON, n.  A soldier who combines dash and steadiness in so equal
measure that he makes his advances on foot and his retreats on
horseback.


Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "dragoon":
   blackjack, bludgeon, bluster, bluster out of, browbeat, bulldoze,
   bully, bullyrag, cavalryman, coerce, cossack, cow, cuirassier,
   demoralize, harass, heavy dragoon, hector, hijack, huff, hussar,
   intimidate, lance, lancer, ruffle, shanghai, spahi, steamroller,
   strong-arm, systematically terrorize, terrorize, threaten, trooper,
   uhlan, use violence