a thin mattress, usually filled with layers of cotton batting and encased in cotton fabric, placed on a floor for sleeping, esp. in traditional Japanese interiors, and folded and stored during the day.
fu·ton (fōō'tŏn) n.
pl.futon or fu·tons A thin mattress of tufted cotton batting or similar material, placed on a floor or on a raised, foldable frame.
[Japanese, bedclothes, bedding : fu, bed quilt (from Middle Chinese phu) + ton, round (from Middle Chinese thuan).]