ton·sure 
(tŏnshər)
(tŏnshər)n.
1. The act of shaving the head or part of the head, especially as a preliminary to becoming a priest or a member of a monastic order.
2. The part of a monk's or priest's head that has been shaved.
tr.v. ton·sured, ton·sur·ing, ton·sures
To shave the head of.
[Middle English, from Old French, from Medieval Latin tōnsūra, from Latin, a shearing, from tōnsus, past participle of tondēre, to shear; see tem- in the Appendix of Indo-European roots.]