A person who has a great deal of knowledge about art and is considered an expert judge in matters of taste. The roles of the connoisseur include appraising the quality of works, attributing authorship, validating authenticity, and advising collectors. Famous connoisseurs include the Greek pottery expert John Davidson Beazley (1885-1970) and the Renaissance specialist Bernard Berenson (1865-1959). Pronunciation here. Web resources here and here.