Cestui

{ ‖or ‖ } pron. [ Norm. F. ] (Law) He; the one. [ 1913 Webster ]

Cestuy que trust ety>[ norm. F. ], a person who has the equitable and beneficial interest in property, the legal interest in which is vested in a trustee. Wharton. --
Cestuy que use ety>[ Norm. F. ], a person for whose use land, etc., is granted to another. [ 1913 Webster ]