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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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Example sentences
The researchers therefore plan follow-up tests with aquarium fish to see if
  they, too, experience inverted slipstreaming.
The aquarium fish industry is worth hundreds of millions of dollars a year
  worldwide and is growing rapidly.
They are also frequently kept as aquarium fish and are noted for their
  aggressive behavior.
Indeed after studying tropical fish in an aquarium it is evident that their
  behaviour patterns are driven by clever strategies.
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