n. 监视器, 监控器；情况通报（monitor复数形式）

n someone who supervises (an examination)

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

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

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

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

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

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

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

v check, track, or observe by means of a receiver