1- Alopecia: A term that describes abnormal hair loss.

2- Alopecia Areata: A non-scarring, reoccurring disease of the hair that can potentially cause hair loss in any area of the scalp.

3- Anagen: The name given to the hair’s growth phase during its biological cycle.

4- Androgens: A term that defines the male hormones.

5- Androgenetic Alopecia: The hereditary thinning of hair caused by androgens in men and women who are genetically susceptible. This condition is also known as male pattern hair loss or female pattern hair loss.

6- Catagen: The name given to the hair’s transitional phase during its biological cycle.

7- Coaltar: A product utilized to control the sebum secreted on the scalp. It is found in shampoos for oily hair.

8- Skin flaps: An out dated surgical procedure in which a “strip” was taken from the back of the head and placed whole in the affected area. It resulted in a “headband” affect.

9- Effluvium: Loosening of the fiber.
- Telogen: When it occurs after a normal telogen phase.
- Anagen: Occurs during the anagen phase.
- Post transplant: When it occurs between the first and third week after the transplant. It is of the anagen type.

10- Electrotricogenesis: A method, without significant scientific support, to detain hair loss.

11- Finasteride: A medicine with scientifically demonstrated ability to detain hair loss.

12- Follicle or Follicular Unit: A functional anatomical structure that can contain up to four hairs. This is the structure that is transplanted.

13- Graft: The term used to define the follicle that is transplanted.

14- Ketoconazol: An anti-micotic used in the form of shampoo for the treatment of dandruff.

15- Melanin: The pigment responsible for giving hair its color.

16- Miniaturization: The name given to the progressive thinning of hair in androgenetic alopecia.

17- Minoxicil: A medication used to detain hair loss.

18- Micro-incision: The technical name given to the place where the follicle is placed in the receptor area.

19- Punch: An outdated surgical technique consisting of extracting patches of skin from the back of the head containing 20 or 30 hairs and then placing them in the receptive zone. It produced the appearance of a doll’s hair or brush bristles.

20- Keratin: A protein that constitutes the fiber of the hair.

21- Hormone Receptor: A molecule that receives the hormones and internalizes them to the interior of the cells, contributing to their function.

22- Telogen: The name given to the hair’s resting phase during its biological cycle.

23- Testosterone: A male hormone.

24- Dihidrotestosterone: A derivative of testosterone with a definitive role in the process of hair loss through its union with the androgenetic receptor, present in follicles containing hair.

25- Zinc Pyrition: A product utilized to control dandruff. It is found in dandruff shampoos.