Source : Webster's Revised Unabridged Dictionary (1913)

Matelass'e \Mate`las`s['e]"\, a. [F., p.p. of matelasser to
   cushion, to cover as with a mattress, fr. matelas mattress.
   See {Mattress}.]
   Ornamented by means of an imitation or suggestion of
   quilting, the surface being marked by depressed lines which
   form squares or lozenges in relief; as, matelass['e] silks.

Matelass'e \Mate`las`s['e]"\, n.
   A quilted ornamented dress fabric of silk or silk and wool.