ton•sure
  Pronunciation: (ton'shur), [key]    — n., v., -sured, -sur•ing. 
  
  
 —n.  - the act of cutting the hair or shaving the head.  
  - the shaving of the head or of some part of it as a religious practice or rite, esp. in preparation for entering the priesthood or a monastic order.  
  - the part of a cleric's head, usually the crown, left bare by shaving the hair.  
  - the state of being shorn.  
  
  
 —v.t.  - to confer the ecclesiastical tonsure upon.  
  - to subject to tonsure.  
  
  
  Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.