Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Aquatic animals that live in the substrate of a body of water, especially in a soft sea bottom.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An aquatic organism that lives within the dominant medium of its environment.

Etymologies

in-2 + fauna.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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