Pyx chest is a term that refers to a container used for holding and protecting the consecrated host or the Eucharist in Christian religious practices. The term "pyx chest" is often used interchangeably with various other synonyms, such as ciborium, montrance, tabernacle, and ostensorium. A ciborium is a chalice-shaped container used for holding the Eucharist during mass, while a monstrance is a vessel with a clear glass portion for displaying the host for public veneration. The tabernacle is another synonym for the pyx chest, which is usually a box-shaped container for storing consecrated hosts in churches. Finally, the ostensorium is another container used for displaying the Eucharist during special processions and adoration.