Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics.
Artificially produced gemstones[?] (such as Ruby (gemstone)) usually contain a dopant to identify them as such.
... Church[?] (1938 from the Northern PCUSA)
Presbyterian Church in America[?] (1973 from the Southern PCUS)
Evangelical Presbyterian Church[?] (1980 from Northern UPC ...