Mat"tress (?), n. [OF. materas, F. matelas, LL. matratium; cf. Sp. & Pg. almadraque, Pr. almatrac; all from Ar. ma&tsdot;rah a place where anything is thrown, what is thrown under something, fr. &tsdot;araha to throw.]
A quilted bed; a bed stuffed with hair, moss, or other suitable material, and quilted or otherwise fastened.
[Written also matress
2. Hydraulic Engin.
A mass of interwoven brush, poles, etc., to protect a bank from being worn away by currents or waves.
© Webster 1913.