The Collaborative International Dictionary of English v.0.48:

Manciple \Man"ci*ple\, n. [From OF. mancipe slave, servant (with
   l inserted, as in participle), fr. L. mancipium. See
   Mancipate.]
   A steward; a purveyor, particularly of a college or Inn of
   Court. --Chaucer.
   [1913 Webster]