con·nois·seur 
(kŏn′ə-sûr, -sr)
(kŏn′ə-sûr, -sr)n.
1. A person with expert knowledge or training, especially in the fine arts.
2. A person of informed and discriminating taste: a connoisseur of fine wines.
[Obsolete French, from Old French connoisseor, from connoistre, to know, from Latin cognōscere, to learn, know; see COGNITION.]
con′nois·seurship′ n.