telogen

This term is a specialized medical and biological descriptor used primarily in dermatology and trichology. It describes a specific physiological state of the hair follicle rather than a physical object, which gives it a technical, clinical register. It is almost exclusively used in professional medical reports or scientific literature regarding alopecia and hair growth cycles.

Because it refers to a biological phase or state, it is treated as an uncountable noun. It does not typically take a plural form, as it describes a condition of the follicle rather than a countable entity.