Source : Webster's Revised Unabridged Dictionary (1913)

Cheval \Che*val"\ (she*v[.a]l"), n.; pl. {Chevaux} (-v[=o]").
   [F. See {Cavalcade}.]
   A horse; hence, a support or frame.

   {Cheval glass}, a mirror swinging in a frame, and large
      enough to reflect the full length figure.

Source : WordNet®

cheval glass
     n : a full length mirror mounted in a frame in which it can be
         tilted