The Collaborative International Dictionary of English v.0.48:
Satrap \Sa"trap\ (? or ?; 277), n. [L. satrapes, Gr. ?, fr. OPers. khshatrap[=a]van ruler: cf. F. satrape.] The governor of a province in ancient Persia; hence, a petty autocrat despot. [1913 Webster]WordNet (r) 3.0 (2006):
satrap n 1: a governor of a province in ancient Persia