The Collaborative International Dictionary of English v.0.48:

Circumcise \Cir"cum*cise\, v. t. [imp. & p. p. Circumcised; p.
   pr. & vb. n. Circumcising.] [L. circumcisus, p. p. of
   circumcidere to cut around, to circumcise; circum + caedere
   to cut; akin to E. c[ae]sura, homicide, concise, and prob. to
   shed, v. t.]
   1. To cut off the prepuce of foreskin of, in the case of
      males, and the internal labia of, in the case of females.
      [1913 Webster]

   2. (Script.) To purify spiritually.
      [1913 Webster]

WordNet (r) 3.0 (2006):

circumcise
    v 1: cut the skin over the clitoris
    2: cut the foreskin off male babies or teenage boys; "During the
       bris, the baby boy is circumcised"