Lose weight: Creating a calorie deficit that results in weight loss is hard work. Most recommendations say that to lose weight, you must exercise for at least an hour a day, five times a week. The type of exercise matters, too.
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. hair shaft. the nongrowing portion of a hair that protrudes from the skin, that is, from the follicle. hair shaft. The keratinized portion of a hair that extends from a hair follicle beyond the surface of the epidermis.
1 Hair is composed of the following structures: 2  The hair shaft is the portion of the hair that is visible on the surface of the skin. 3  The hair root is the portion of the hair that penetrates the skin (epidermis and dermis).  The hair follicle is the sheath that surrounds the hair in the skin.