connoisseur (n.) Look up connoisseur at Dictionary.com
1714, from French connoisseur (Modern French connaiseur), from Old French conoisseor "an expert, a judge, one well-versed," from conoistre "to know," from Latin cognoscere "to know, to become well-acquainted with," from com- "with" (see com-) + gnoscere "recognize" (see notice (v.)).