mattress (n.)

late 13c., from Old French materas (12c., Modern French matelas), from Italian materasso and directly from Medieval Latin matracium, borrowed in Sicily from medieval Arabic al-matrah "(the) large cushion or rug for lying on" (also source of Spanish almadraque "mattress," Provençal and Catalan-Latin almatrac), literally "the thing thrown down," from taraha "he threw (down)" with noun prefix ma-.