A device that individuals under house arrest or parole are often required to wear to track their location. It is attached to the person's ankle.

plural of baby monitor

plural of ankle monitor

A loudspeaker specifically designed for audio production applications.

plural of studio monitor

A nozzle firmly mounted to a vehicle or structure and capable of turning completely round in a horizontal plane while having a limited play in a vertical plane, used in hydraulic mining, fire-extinguishing apparatus, etc.

(US) A person responsible for maintaining order in a school's corridors and halls.

(US) Alternative form of hall monitor

plural of hall monitor

(medicine) A portable device for continuously monitoring the electrical activity of the heart, usually for 24 hours or more.