Definition from Wiktionary, the free dictionary
See also tonsils
tonsil (plural tonsils)
- (anatomy, immunology) Either of a pair of small masses of lymphoid tissue that lie on each side of the throat and that help protect the body against infection; palatine tonsil.
- (anatomy, immunology) Any of various small masses of lymphoid tissues, including palatine tonsils, adenoids and lingual tonsils.
Derived terms 
any of the lymphoid masses
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