1. The study of hair structure.
2. The science dealing with hair.

Loss of hair and thinning hair is usually a temporary condition that can affect both women and men. Balding is most often a hereditary condition that affects a large proportion of men. Alopecia is more serious hair loss, but all of these can be treated with hair replacement therapy and other tricology treatment.

Tricology is its own branch of science derived from beauty care (cosmetology) and dermatology.