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| a soft, fatty, vascular tissue in the interior cavities of bones that is a major site of blood cell production |
| the expanding and contracting opening in the iris of the eye, through which light passes to the retina |
tonsil ton·sil (tŏn'səl)
n.
A collection of lymphoid tissue.
A small oral mass of lymphoid tissue, especially either of two such masses embedded in the lateral walls of the opening between the mouth and the pharynx, of uncertain function, but believed to help protect the body from respiratory infections. Also called faucial tonsil, palatine tonsil.