The Collaborative International Dictionary of English v.0.48:

Sadr \Sadr\, n. (Bot.)
   A plant of the genus Ziziphus (Ziziphus lotus); -- so
   called by the Arabs of Barbary, who use its berries for food.
   See Lotus
   (b) .
       [1913 Webster]

WordNet (r) 3.0 (2006):

Ziziphus lotus
    n 1: shrubby deciduous tree of the Mediterranean region [syn:
         lotus tree, Ziziphus lotus]