defaunatev.

Brit.

/diːˈfɔːneɪt/, U.S.

/diˈfɔˌneɪt/,

/diˈfɑˌneɪt/

Origin: Formed within English, by derivation. Etymons: de- prefix, fauna n., -ate suffix³.

Etymology: < de- prefix + fauna n. + -ate suffix³, after depopulate v., Compare slightly earlier defaunated adj., and defaunation n.

1. transitive. To remove parasitic or symbiotic protozoans or invertebrates from (a host organism or a part of its body); spec. to treat (a ruminant or its rumen) with agents that eliminate ciliate protozoans. Occasionally also intransitive.

ΚΠ

1924 L. R. Cleveland in Biol. Bull. 46 181 The termites lose their ability to digest wood when the protozoa are removed from their intestine, that is when they are defaunated, but regain this ability when reinfected with protozoa.

1944 Ann. N.Y. Acad. Sci. 44 212 More than 1500 [persons] had been given 9 or more consecutive hookworm treatments in order to defaunate to the last ovipositing worm.

1969 Irish Jrnl. Agric. Res. 8 210 All of the sheep were defaunated after 28 days and the protozoa did not re-appear during the remainder of the experiment.

1990 D. Minson Forage in Ruminant Nutrition vi. 205 The methods at present used to defaunate ruminants cannot be applied in the grazing industry.

2013 A.-D. G. Wright & S. E. Hook in E. Kebreab Sustainable Animal Agric. xvi. 258/2 Treatments normally used to defaunate the rumen include copper sulfate, acids,..ionophores and saponins.

2. transitive. To destroy (part of) the animal life of (a region, habitat, etc.).

ΚΠ

1969 Ecology 50 272/1 Our first attempt to defaunate islands made use of an insecticide spray of short-lived residual effect.

1981 H. Heatwole et al. Community Ecol. Coral Cay v. 30 After Krakatau was defaunated by volcanic activity, the first community to become established resembled that of bare sand cays.

1995 I. Valiela Ecol. Processes (ed. 2) xii. 368 Tidal surges, storms, pollution, and predation can defaunate patches of soft bottoms.

2012 Biogeosciences 9 3652/2 Using formalin to defaunate sediments caused a significant increase in erosion threshold.

This entry has been updated (OED Third Edition, December 2016; most recently modified version published online March 2022).

单词	defaunate
释义	defaunatev. Brit. /diːˈfɔːneɪt/, U.S. /diˈfɔˌneɪt/, /diˈfɑˌneɪt/ Origin: Formed within English, by derivation. Etymons: de- prefix, fauna n., -ate suffix³. Etymology: < de- prefix + fauna n. + -ate suffix³, after depopulate v., Compare slightly earlier defaunated adj., and defaunation n. 1. transitive. To remove parasitic or symbiotic protozoans or invertebrates from (a host organism or a part of its body); spec. to treat (a ruminant or its rumen) with agents that eliminate ciliate protozoans. Occasionally also intransitive. ΚΠ 1924 L. R. Cleveland in Biol. Bull. 46 181 The termites lose their ability to digest wood when the protozoa are removed from their intestine, that is when they are defaunated, but regain this ability when reinfected with protozoa. 1944 Ann. N.Y. Acad. Sci. 44 212 More than 1500 [persons] had been given 9 or more consecutive hookworm treatments in order to defaunate to the last ovipositing worm. 1969 Irish Jrnl. Agric. Res. 8 210 All of the sheep were defaunated after 28 days and the protozoa did not re-appear during the remainder of the experiment. 1990 D. Minson Forage in Ruminant Nutrition vi. 205 The methods at present used to defaunate ruminants cannot be applied in the grazing industry. 2013 A.-D. G. Wright & S. E. Hook in E. Kebreab Sustainable Animal Agric. xvi. 258/2 Treatments normally used to defaunate the rumen include copper sulfate, acids,..ionophores and saponins. 2. transitive. To destroy (part of) the animal life of (a region, habitat, etc.). ΚΠ 1969 Ecology 50 272/1 Our first attempt to defaunate islands made use of an insecticide spray of short-lived residual effect. 1981 H. Heatwole et al. Community Ecol. Coral Cay v. 30 After Krakatau was defaunated by volcanic activity, the first community to become established resembled that of bare sand cays. 1995 I. Valiela Ecol. Processes (ed. 2) xii. 368 Tidal surges, storms, pollution, and predation can defaunate patches of soft bottoms. 2012 Biogeosciences 9 3652/2 Using formalin to defaunate sediments caused a significant increase in erosion threshold. This entry has been updated (OED Third Edition, December 2016; most recently modified version published online March 2022). < v.1924
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