Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Aquatic animals, such as clams or burrowing worms, that live beneath the surface of a sea or lake floor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[in– + fauna.]

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