Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. A variety of pigeon. --Clarke.

   {Dragoon bird} (Zo["o]l.), the umbrella bird.