catagen

:  a short transition phase of the hair growth cycle in which hair growth ends and the resting phase begins Anagen is followed by a regressive stage called catagen, of about two to three weeks, then a resting stage, telogen, of about three months.—C. Claiborne Ray, The New York Times, 29 June 2010 In catagen, the hair follicle stops producing the fiber and regresses, shrinking dramatically.—Damaris Christensen, Science News, 20 Oct. 2001