[Fr., from L. glans, acorn.] A knot of nerves, blood-vessels, and flesh in the body for drawing off certain substances from the blood. Each of the thousands of pores of the skin is really an outlet of a tube which connects with a sweat-gland absorbing water from the blood. Two oil-glands are attached to each hair, and the natural oil ought to be sufficient for the hair. The oily matter runs out of the skin and mixes with the sweat. The sweat produced by the skin of an ordinary man in twenty-four hours measures a pint and a quarter, and weighs 11/2 lb.