monitor

US /ˈmɑː.nə.t̬ɚ/
UK /ˈmɑː.nə.t̬ɚ/
"monitor" picture
1.

an instrument or device used for observing, checking, or keeping a continuous record of something

:
The nurse checked the patient's vital signs on the monitor.
He spent hours staring at the computer monitor.
2.

a large lizard, typically tropical, with a long tail, limbs, and neck, and a forked tongue

:
We saw a huge monitor lizard basking in the sun.
The zoo has several species of monitor lizards.
1.

to observe and check the progress or quality of (something) over a period of time; keep under systematic review

:
The doctor will monitor your condition closely.
We need to monitor the environmental changes.