One who admonishes; one who warns of faults, informs of duty, or gives advice and instruction by way of reproof or caution, An ironclad war vessel, very low in the water, and having one or more heavily-armored revolving turrets, carrying heavy guns, Someone who watches over something; a person in charge of something or someone, verb_ keep tabs on; keep an eye on; keep under surveillance, intransitive verb_ To test or sample, especially on a regular or ongoing basis, To direct, To act as a monitor