n. pl. a·quar·i·ums or a·quar·i·a (-ē-ə)
1. A tank, bowl, or other water-filled enclosure in which living fish or other aquatic animals and plants are kept.
2. A place for the public exhibition of live aquatic animals and plants.
[Latin aquārium, source of water, from neuter of aquārius, of water, from aqua, water; see akw-ā- in the Appendix of Indo-European roots.]
a·quari·al (-ē-əl) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.