Source : Webster's Revised Unabridged Dictionary (1913)

Lambrequin \Lam"bre*quin\, n. [F. Cf. {Lamboys}, {Label}.]
   1. A kind of pendent scarf or covering attached to the
      helmet, to protect it from wet or heat.

   2. A leather flap hanging from a cuirass. --Wilhelm.

   3. A piece of ornament drapery or short decorative hanging,
      pendent from a shelf or from the casing above a window,
      hiding the curtain fixtures, or the like.

Source : WordNet®

lambrequin
     n 1: a scarf that covers a knight's helmet
     2: short and decorative hanging for a shelf edge or top of a
        window casing