adenoids Masses of lymphatic tissue in the upper part of the pharynx (throat) behind the nose. Adenoids form part of a child's defenses against disease. They normally disappear by the age of ten. When infected, the adenoids become swollen, and may need to be removed surgically. See also lymphatic system. Related category • ANATOMY AND PHYSIOLOGY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |