The Collaborative International Dictionary of English v.0.48:

Ephor \Eph"or\, n.; pl. Ephors, L. Ephori. [L. ephorus, Gr.
   ?, fr. ? to oversee; ? + ? to see: cf. F. ['e]phore.] (Gr.
   Antiq.)
   A magistrate; one of a body of five magistrates chosen by the
   people of ancient Sparta. They exercised control even over
   the king.
   [1913 Webster]