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The Nuttall Encyclopedia
The name of a cup-shaped, gold-lined vessel, with lid, used in the Roman Catholic churches for containing the eucharistic elements after their consecration either for adoration in the churches or for conveying to sick-rooms. Pyx means "box." Hence
he annual test of the British coinage, for which purpose one coin in every 15 lbs. of gold and one in every 60 lbs. of silver coined is set aside in a pyx or box.
Wood, James, ed. Entry for 'Pyx'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/p/pyx.html. Frederick Warne & Co Ltd. London. 1900.