(anatomy) Any one of four endocrine glands situated in the neck, usually within a thyroid gland, which produce parathyroid hormone.

(anatomy) Any of various glands that secrete hormones directly into the blood or lymph and not through a duct.

(anatomy) An endocrine gland, about the size of a pea, that sits in a small, bony cavity at the base of the brain whose secretions control the other endocrine glands and influence growth, metabolism, and maturation.

(anatomy) A gland in male mammals surrounding the urethra just below the urinary bladder that controls the release of urine from the bladder and produces a secretion that is the fluid part of semen.

(anatomy) A gland of the skin which secretes an oily substance, sebum, usually into a hair follicle near the surface of the skin.

(anatomy) Any of various glands which secrete via a duct, typically into the digestive tract or onto the skin.

(anatomy) A large butterfly-shaped endocrine gland situated on the front of the neck that produces various hormones.

(anatomy) In mammals, either of a pair of complex endocrine glands, situated above each kidney, secreting hormones which control the heart rate, blood pressure, and metabolism.

An exocrine gland which secretes a clear fluid known as pre-ejaculate or Cowper’s fluid (colloquially known as “pre-cum”) which is generated upon sexual arousal.

Any specialized gland in some fishes and amphibians that secretes a mucus-like substance containing venomous or acrid material.