monitor

noun

1
any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles
2
an ironclad vessel built by Federal forces to do battle with the Merrimac
3
a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble
4
electronic equipment that is used to check the quality or content of electronic transmissions
5
display produced by a device that takes signals and displays them on a television screen or a computer monitor
6
someone who gives a warning so that a mistake can be avoided
7
someone who supervises (an examination)

1
keep tabs on; keep an eye on; keep under surveillance
we are monitoring the air quality
the police monitor the suspect's moves
2
check, track, or observe by means of a receiver

Also useful for “monitor”:Unscrambler— Rearrange the letters in “monitor”