/ Dictionary / Index A aquarium: Meaning and Definition of Find definitions for: a•quar•i•um Pronunciation: (u-kwâr'ē-um), [key] — pl. a•quar•i•ums, a•quar•i•a 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aquarium (Thesaurus) aquarist Aquarius Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language