(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.

Varanus bengalensis, a monitor lizard distributed widely in the Indian Subcontinent, as well as parts of Southeast Asia and West Asia.

To monitor itself or oneself.

(BDSM) A person charged with supervising BDSM activities at a play party or a BDSM club.

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.

A wearable device that allows a user to measure their heart rate in real time, usually consisting of a chest strap transmitter and a wrist receiver.

(computing) Synonym of hypervisor

plural of lace monitor