Wordnet 3.0
NOUN (1)
1. 
 (law) someone who conveys a title or property to another; 
WordNet (r) 3.0 (2006):
transferor
    n 1: (law) someone who conveys a title or property to another
Bouvier's Law Dictionary, Revised 6th Ed (1856):
TRANSFEROR. One who makes a transfer.