The Collaborative International Dictionary of English v.0.48:

Monothelite \Mo*noth"e*lite\, n. [Gr. ?; mo`nos alone, only + ?,
   ?, to will, be willing: cf. F. monoth['e]lite.] (Eccl. Hist.)
   One of an ancient sect who held that Christ had but one will
   as he had but one nature. Cf. Monophysite. --Gibbon.
   [1913 Webster]