Waldeyer’s ring

Definition of Waldeyer’s ring
National Cancer Institute

Waldeyer’s ring

(VAL-dy-erz …)
A ring of lymphoid tissue found in the throat. The Waldeyer’s ring is made up of the tonsils, adenoids, and other lymphoid tissue. It contains lymphocytes (a type of immune cell) that help the body fight infection and disease.

Source: NCI Dictionary of Cancer Terms