PYX (Gr. πυξίς, a box or chest), a term for various forms of receptacle. In ecclesiastical usage it is the sacred vase or tabernacle in which the Host is reserved. In the English Mint the pyx is the chest in which are placed one coin from every 15 ℔ of newly coined gold and one from every 60 ℔ of newly coined silver to await the “trial of the pyx” (see Mint). This chest was formerly kept in the Chapel of the Pyx in Westminster Abbey.