term:

Merchant

merchant n

: a person who trades in goods esp. of a certain kind and possesses expertise in the area of the goods and the practices of trading in them or who employs others with such expertise [a warranty that the goods shall be merchantable is implied in a contract for their sale if the seller is a with respect to goods of that kind "Uniform Commercial Code"]

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.