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de·mo·dex | \ ˈdem-ə-ˌdeks 
, ˈdēm- \
, ˈdēm- \Medical Definition of demodex
1 capitalized : a genus (coextensive with a family Demodicidae) of minute elongated cylindrical mites with the legs greatly reduced that live in the hair follicles especially about the face of humans and various furred mammals and in the latter often cause demodectic mange
2 : any mite of the genus Demodex : follicle mite
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