Webster's English Dictionary

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connoisseur

con.nois.seur \.ka:n-*-'s*r also -'su.(*)r\ \-.ship\ n [obs. F (now 
   connaisseur), fr. OF connoisseor, fr. connoistre] to know, fr. L cognoscere 
   - more at COGNITION : EXPERT; esp : one who understands the details, 
   technique,  or principles of an art and is competent to act as a critical 
   judge - con.nois.seur.ship n