an·​a·​gen | \ˈa-nə-ˌjen \

Definition of anagen 

: the active phase of the hair growth cycle that precedes catagen and telogen, that is marked by rapid division and differentiation of cells in the lower portion of the hair follicle and by lengthening of the hair shaft, and that typically lasts between two to six years

Note: At any given time, approximately 80 to 90% of hair follicles are in anagen.

Examples of anagen in a Sentence

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The subsequent decline in estrogen levels and rise of the stress hormone cortisol causes hair to move from the anagen cycle (growth) to the telogen phase (shedding), Wesley describes. Priya Rao, Vogue, "How to Deal With Post-Pregnancy Hair Loss, According to the Experts," 19 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'anagen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of anagen

1926, in the meaning defined above

History and Etymology for anagen

ana- + -gen

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The first known use of anagen was in 1926

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an·​a·​gen | \ˈan-ə-ˌjen \

Medical Definition of anagen 

: the active phase of the hair growth cycle preceding catagen and telogen The initial step, anagen, provides the active growth of the hair fiber, during which cells at the base of the follicle rapidly divide.— Damaris Christensen, Science News, 20 Oct. 2001

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a soft lustrous wool fabric with mohair

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