The Collaborative International Dictionary of English v.0.48:

Fellah \Fel"lah\, n.; pl. Ar. Fellahin, E. Fellahs. [Ar.]
   A peasant or cultivator of the soil among the Egyptians,
   Syrians, etc. --W. M. Thomson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fellah
    n 1: an agricultural laborer in Arab countries