noun, plural aquariums, aquaria [uh-kwair-ee-uh] .
a glass-sided tank, bowl, or the like, in which fish or other living aquatic animals or plants are kept.
a building or institution in which fish or other aquatic animals or plants are kept for exhibit, study, etc.

1840–50; blend of Latin aquārius of or for water (aqu(a) water + -ārius -ary) and vivarium; cf. -arium

aquarial, adjective

aquarium, Aquarius. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aquarium (əˈkwɛərɪəm)
n , pl -riums, -ria
1.  a tank, bowl, or pool in which aquatic animals and plants are kept for pleasure, study, or exhibition
2.  a building housing a collection of aquatic life, as for exhibition
[C19: from Latin aquārius relating to water, on the model of vivarium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1854, from L. neut. of aquarius, gen. of aqua "water" (see aqua-). The word existed in L., but meant "drinking place for cattle." An earlier attempt at a name for "fish tank" was marine vivarium.
Online Etymology Dictionary, © 2010 Douglas Harper
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