Added 9 October 2026 vivarium /vaɪˈvɛəɹi.əm/ noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about vivarium at Wordnik → Where our words come from → An indoor enclosure for keeping and raising living animals and plants and observing them under natural conditions. Related Words: aquariumreptilariumterrariummenagerieseraglioaviaryrabbitryreservatoryisolatorcage Back to today's word