aquarium
 oxford
 views  updated May 11 2018a·quar·i·um  / əˈkwe(ə)rēəm/ •
n. (pl.  -i·umsor -i·a / -ēə/ ) a transparent tank of water in which fish and other water creatures and plants are kept. ∎  a building containing such tanks, esp. one that is open to the public.
 The Oxford Pocket Dictionary of Current English 
   aquarium
 oxford
 views  updated May 18 2018aquarium XIX. sb. use of n. sg. of L. 
aquārius of water, f. 
aqua water (see 
-ARY); after 
VIVARIUM.
  The Concise Oxford Dictionary of English Etymology T. F. HOAD
   Aquarium
 gale
 views  updated Jun 27 2018Aquarium
a place for keeping fish; a collection of tanks for fish, hence, the fish themselves collectively —Wilkes.
 Dictionary of Collective Nouns and Group Terms