mer·chant /'mər-chənt/ 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 merchant with respect to goods of that kind — Uniform Commercial Code
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.