18. A veil or curtain of silk, satin, velvet, or cloth of gold or silver is used to enclose the tabernacle for the Blessed Sacrament when reserved in the Roman Catholic Church. It is called the veil for the tabernacle, and came into use most probably when the setting-up of tabernacles became general.
Taking the veil is a term used to designate the act of consecration to the Church, when a female takes upon herself vows, after, which she never appears in public unveiled. SEE NUN.