IPA: /vɪˈvɛəriəm/
KK: /vɪˈveəriəm/
A space designed to keep and care for living animals and plants, allowing them to grow in conditions similar to their natural environment, often used for study or observation.
The scientist set up a vivarium to observe the behavior of the frogs in a controlled environment.
Vivarium is formed from "vivus" (meaning alive) and "-arium" (meaning a place for). The word refers to a place for keeping living organisms, especially plants and animals, in a controlled environment.
Think of a 'place for' ('-arium') keeping things 'alive' ('vivus') — that's what a vivarium is, a space for living things.