aquarium

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US /əˈkwer.i.əm/ 
UK /əˈkweə.ri.əm/ 

Longman Dictionary of Contemporary English

aquarium /əˈkweəriəm $ əˈkwer-/ BrE AmE noun (plural aquariums or aquaria /-riə/) [countable]
[Date: 1800-1900; Language: Latin; Origin: aquarius 'of water', from aqua; ⇨ ↑aquatic]
1. a clear glass or plastic container for fish and other water animals
2. a building where people go to look at fish and other water animals

 

Oxford Advanced Learner's Dictionary

aquar·ium [aquarium aquaria aquariums]   [əˈkweəriəm]   [əˈkweriəm]  noun (pl. aquar·iums or aqua·ria   [əˈkweəriə]  ;   [əˈkweriə]  )

1. a large glass container in which fish and other water creatures and plants are kept

2. a building where people can go to see fish and other water creatures 

Word Origin:

mid 19th cent.: from Latin, neuter of aquarius ‘of water’, on the pattern of vivarium.

Cambridge Advanced Learner's Dictionary

aquarium /əˈkweə.ri.əm/ US /-ˈkwer.i-/
noun [C] plural aquariums or aquaria
1 a glass container in which fish and other water animals can be kept

2 a building, usually open to the public, which holds many aquariums

Collins Advanced Learner’s English Dictionary

[əkwe͟əriəm]
 aquariums, aquaria (plural) [pr][əkwe͟əriə][/pr]
 1) N-COUNT An aquarium is a building, often in a zoo, where fish and underwater animals are kept.
 2) N-COUNT An aquarium is a glass tank filled with water, in which people keep fish.