Definition of defaunation in English:

defaunation

noun

  • 1The removal of parasitic or symbiotic protozoans or invertebrates from a host organism or a part of its body, specifically the elimination of the ciliate protozoan population in the rumen of a ruminant; an instance of this.

  • 2Destruction or loss of (part of) the animal life of a region, habitat, etc.; an instance of this.

Origin

1920s. From de- + fauna + -ation, after depopulation.

Pronunciation

defaunation

/ˌdiːfɔːˈneɪʃn/