Varanus exanthematicus, a species of monitor lizard.

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.

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.

A loudspeaker specifically designed for audio production applications.

plural of monitor nozzle

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

(US) Alternative form of hall monitor

(UK, historical) A schoolchild assigned the duty of handing out servings of milk to the other children.

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

A device with earbud-like earpieces used to provide audio to someone while eliminating external noise. A primary usage is to let stage performers clearly hear their live performance or various instructions.