gland

noun

1. any organ or specialized group of cells that produces secretions, as insulin or bile, or excretions, as urine: some glands, as the liver and kidneys, have ducts that empty into an organ: the ductless (or endocrine) glands, as the thyroid and adrenals, secrete hormones
2. loosely any similar structure that is not a true gland: lymph glands
3. Bot. an organ or layer of cells that produces and secretes some substance

noun