Merchant \Mer"chant\, a. Of, pertaining to, or employed in, trade or merchandise; as, the merchant service. {Merchant bar}, {Merchant iron} or {steel}, certain common sizes of wrought iron and steel bars. {Merchant service}, the mercantile marine of a country. --Am. Cyc. {Merchant ship}, a ship employed in commerce. {Merchant tailor}, a tailor who keeps and sells materials for the garments which he makes.