Medical Definition of telogen
: the resting phase of the hair growth cycle following anagen and catagen and preceding shedding <Scalp hairs spend four to eight years in anagen and just two to four months in telogen.—Julianne Dunphy, Discover, May 2000> <The remaining 10 percent of hairs are in a resting phase called telogen that lasts about three months, after which the resting hairs start falling out.—Jane E. Brody, The New York Times, 20 Nov. 2001>
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