merchandise (n.)

mid-13c., marchaundise, "trading, commerce, action or business of buying and selling goods or commodities for profit;" mid-14c., "commodities of commerce; wares, movable objects, and articles for sale or trade," from Anglo-French marchaundise, Old French marcheandise "goods, merchandise; trade, business" (12c.), from marchaunt "merchant" (see merchant). The plural had become obsolete in English by late 19c.