Webster's English Dictionary

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escutcheon

es.cutch.eon \is-'k*ch-*n\ n [ME escochon, fr. MF escuchon, fr. (assumed) 
   VL scution-, ]scutio, fr. L scutum shield - more at ESQUIRE 1: a defined 
   area on which armorial bearings are displayed usu. consisting  of a shield 
   : COAT OF ARMS 2: a protective or ornamental shield (as around a keyhole)  
   3: the part of a ship's stern on which the name is displayed