monitor

/ˈmɒnɨtə/noun

A screen, similar to a television, that displays the output of a computer.

Example sentence

“She plugged a second monitor into her laptop to see more windows at once.”

As a verb it means to watch something over time, the sense behind 'heart monitor' and the school 'hall monitor'.

Related words

printerA machine, typically connected to a computer, that puts text or pictures onto paper; also a similar device that builds three-dimensional objects.headphonesA pair of small speakers worn over or inside the ears so that only the wearer hears the sound.folderA named storage area on a computer where files and other folders can be kept together.routerA device that directs data traffic between computer networks, deciding where each packet of information should go.serverA computer or program that supplies data or services to other computers or programs, often across a network.backupA spare copy of data kept separately from the original so it can be restored if the original is lost or damaged.