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aquarium

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An aquarium is a container that holds marine plants and animals or a building where exhibits of marine plants and animals are set up for visitors to view. (noun)

An example of an aquarium is a fish tank.
An example of an aquarium would be the fish exhibit in a zoo.

See aquarium in Webster's New World College Dictionary

noun pl. aquariums or aquaria

a tank, usually with glass sides, or a pool, bowl, etc. for keeping live water animals and water plants
a building where such collections are exhibited

See aquarium in American Heritage Dictionary 4

(ə-kwârˈē-əm)

noun pl. a·quar·i·ums or a·quar·i·a (-ē-ə)

A tank, bowl, or other water-filled enclosure in which living fish or other aquatic animals and plants are kept.
A place for the public exhibition of live aquatic animals and plants.

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