proctor, monitor (noun)

someone who supervises (an examination)

admonisher, monitor, reminder (noun)

someone who gives a warning so that a mistake can be avoided

Monitor (noun)

an ironclad vessel built by Federal forces to do battle with the Merrimac

monitor, monitoring device (noun)

display produced by a device that takes signals and displays them on a television screen or a computer monitor

monitor (noun)

electronic equipment that is used to check the quality or content of electronic transmissions

monitor (noun)

a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble

monitor, monitor lizard, varan (verb)

any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles

monitor, supervise (verb)

keep tabs on; keep an eye on; keep under surveillance

"we are monitoring the air quality"; "the police monitor the suspect's moves"

monitor (verb)

check, track, or observe by means of a receiver

monitor (Noun)

Someone who watches over something; a person in charge of something or someone.

monitor (Noun)

A device similar to a television set used as to give a graphical display of the output from a computer.

monitor (Noun)

A program for viewing and editing, as in machine code monitor.

monitor (Noun)

A student leader in a class.

monitor (Noun)

A class of relatively small armored warships designed for shore bombardment or riverine warfare rather than combat with other ships.

monitor (Noun)

An ironclad.

monitor (Noun)

A monitor lizard.

monitor (Verb)

To watch over; to guard.

Monitor (ProperNoun)

Any of several publications e.g. the "Christian Science Monitor".

Monitor (ProperNoun)

A text of works or instruction which are not secret and may be written e.g. "Indiana Monitor and Freemasons' Guide".

Monitor

A monitor was the class of relatively small warship which was neither fast nor strongly armoured but carried disproportionately large guns. They were used by some navies from the 1860s until the end of World War II, and saw their final use by the United States Navy during the Vietnam War. The monitors of the 19th century were turreted ironclad warships inspired by the original USS Monitor; as well as coastal ships which closely followed her design. The term "monitor" also encompassed more flexible breastwork monitors, and was sometimes used as a generic term for any turreted ship. The term "monitor" also represents the strongest of riverine warcraft, known as river monitors. In the early 20th century, the term "monitor" was revived for shallow-draft armoured shore bombardment vessels, particularly those of the British Royal Navy: the Lord Clive class monitors carried guns firing heavier shells than any other warship ever has, seeing action against German targets during World War I. The Lord Clive vessels were scrapped in the 1920s.