from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The smallest of the faunal size divisions, including mainly microorganisms but also sometimes applied to the tiniest species of animal groups such as ticks, insects, etc.
from The Century Dictionary and Cyclopedia
- n. A fauna in which all the animals are of minute or diminutive size; a congeries of microscopic animals, or sometimes a depauperated fauna.
From micro- (“small, tiny”) + fauna (“animals”). (Wiktionary)