In this Adventure in Etymology, we’re finding connections between monitors and monsters.

A monitor [ˈmɒn.ɪ.tə/ˈmɔn.ɪ.tɚ] is:

• Someone who watches over something; a person in charge of something or someone.
• A device that detects and informs on the presence, quantity, etc., of something.
• A device used to give a graphical display of the output from a computer. (other meanings are available)

It comes from Latin monitor (counsellor, preceptor, prompter), from moneō (to warn, advise, remind), from Proto-Italic *moneō (to remind, warn), from Proto-Indo-European *moné-ye-ti, from *mon-éye-, from *men- (to think) [