[noun][from 1592]short for 座布団 (zabuton, “seat / sitting cushion”)
[noun][from 1638](most common sense in modern usage) traditional Japanese-style bedding, more specifically the 敷布団(shiki-buton, “mattress”, literally “spreading / laying-down futon”) or 掛け布団(kake-buton, “duvet or quilt”, literally “covering futon”), or a set of both, spread directly on a tatami floor