The Collaborative International Dictionary of English v.0.48:

Hicksite \Hicks"ite\, n.
   A member or follower of the "liberal" party, headed by Elias
   Hicks, which, because of a change of views respecting the
   divinity of Christ and the Atonement, seceded from the
   conservative portion of the Society of Friends in the United
   States, in 1827.
   [1913 Webster]