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adrenal gland either of two small glands of different shapes, located above the kidneys, that secrete adrenaline and various steroid hormones.
ductless gland see "endocrine."
pineal gland a gland at the base of the brain that produces melatonin and regulates certain biological rhythms as well as other important functions.
pituitary gland see "pituitary."
prostate gland the muscular gland that surrounds the urethra at the base of the bladder in male mammals, and that secretes a fluid discharge for sperm.
sweat gland any of numerous tiny tubular glands located near the surface of the skin, that secrete sweat.
thyroid gland a two-lobed endocrine gland that is located on both sides of the trachea, with a slender connecting tissue, and that produces secretions that control growth and metabolism.