exogen

noun
ex·o·gen | \ˈek-sə-ˌjen \

Definition of exogen 

: the phase of the hair growth cycle that follows telogen and precedes anagen and during which the hair shaft is released from the hair follicle and is shed from the body

First Known Use of exogen

1998, in the meaning defined above

History and Etymology for exogen

exo- + -gen (in anagen, telogen)

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The first known use of exogen was in 1998

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