n. 鉴赏家, 鉴定家, 内行

[ noun ]
an expert able to appreciate a field; especially in the fine arts
<noun.person>

Connoisseur \Con`nois*seur"\ (?; 277), n. [F. connaisseur,
formerly connoisseur, fr. conna[^i]tre to know, fr. L.
cognoscere to become acquainted with; co- + noscere,
gnoscere, to learn to know. See {Know}, and cf. {Cognizor}.]
One well versed in any subject; a skillful or knowing person;
a critical judge of any art, particulary of one of the fine
arts.

The connoisseur is ``one who knows,'' as opposed to the
dilettant, who only ``thinks he knows.'' --Fairholt.