campbellite

from The Century Dictionary.

• noun A member of the denomination otherwise known as the Disciples of Christ, founded by the Rev. Alexander Campbell. The Campbellites were also called New Lights. See disciple.
• noun 2, One of the followers of the Rev. John McLeod Campbell, who, when deposed in 1831 for teaching the universality of the atonement, founded a separate congregation.
• noun [lowercase] A local name of a sunfish, Pomoxys annularis, abundant in the Mississippi. Also called new-light.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Eccl.) A member of the denomination called Christians or Disciples of Christ. They themselves repudiate the term Campbellite as a nickname. See Christian, 3.