noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   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.

Etymology

From micro- (“small, tiny”) + fauna (“animals”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.