'Lambrequin' definitions:

Definition of 'lambrequin'

noun

A scarf that covers a knight's helmet

noun

Short and decorative hanging for a shelf edge or top of a window casing

From: GCIDE

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. [1913 Webster]
2. A leather flap hanging from a cuirass. --Wilhelm. [1913 Webster]
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. [1913 Webster]

From: GCIDE

Mantling \Man"tling\, n. (Her.) The representation of a mantle, or the drapery behind and around a coat of arms: -- called also lambrequin. [1913 Webster]