anagen
noun
an·a·gen
ˈa-nə-ˌjen
: 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.
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Merriam-Webster unabridged
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