Definition of "gland"

(zoology) A specialized cell, group of cells, or organ of endothelial origin in the human or animal body that synthesizes a chemical substance, such as hormones or breast milk, and releases it, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).

1. (anatomy) A structure resembling a gland, especially a lymph node.  examples

(botany) A secretory structure on the surface of an organ.  examples

(mechanics) A compressable cylindrical case and its contents around a shaft where it passes through a barrier, intended to prevent the passage of a fluid past the barrier, used for example around a ship’s propeller shaft or around a tap, valve or faucet.  examples