Source : Webster's Revised Unabridged Dictionary (1913)

Aquarium \A*qua"ri*um\, n.; pl. E. {Aquariums}, L. {Aquaria}.
   [L. See {Aquarius}, {Ewer}.]
   An artificial pond, or a globe or tank (usually with glass
   sides), in which living specimens of aquatic animals or
   plants are kept.

Source : WordNet®

aquarium
     n : a tank or pool or bowl filled with water for keeping live
         fish and underwater animals [syn: {fish tank}, {marine
         museum}]
     [also: {aquaria} (pl)]