withdrawer

from WordNet (r) 3.0 (2006)

withdrawer
    n 1: an authority who withdraws permission
    2: an individualist who withdraws from social interaction
    3: a drug addict who is discontinuing the use of narcotics
    4: a contestant who withdraws from competition
    5: a student who withdraws from the educational institution in
       which he or she was enrolled
    6: a depositor who withdraws funds previously deposited

from The Collaborative International Dictionary of English v.0.48

Withdrawer \With*draw"er\, n.
   One who withdraws; one who takes back, or retracts.
   [1913 Webster]