Noah Webster's Dictionary (n.) One who has care or custody, as of some public building; a keeper or superintendent.

Multi-Version Concordance Custodian (2 Occurrences) Galatians 3:24 So that the law has become our tutor to bring us to Christ, that we might be justified by faith. (See RSV) Galatians 3:25 But now that faith has come, we are no longer under a tutor. (See RSV)