Thayer's Greek Lexicon

 1. to cut around
2. to circumcise
  1) cut off one's prepuce (used of that well known rite by which
not only the male children of the Israelites, on the eighth
day after birth, but subsequently also "proselytes of
righteousness" were consecrated to Jehovah and introduced into
the number of his people)
  2) to get one's self circumcised, present one's self to be
circumcised, receive circumcision
  3) since by the rite of circumcision a man was separated from the
unclean world and dedicated to God, the word is transferred to
denote the extinguishing of lusts and the removal of sins