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ectothrix adj occurring on the surface of the hair shaft <\ectothrix fungi> also characterized by the presence of hyphae or arthroconidia on the surface of the hair shaft <\ectothrix tinea capitis> compare endothrix
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ec·to·thrix (ekґto-thriks) [ecto- + -thrix] a fungus that grows inside the hair shaft and also produces a sheath of arthrospores on the outside of the hair.Medical dictionary. 2011.