Definition of adenoids noun from the Oxford Advanced Learner's Dictionary

 

adenoids

 noun
noun
BrE BrE//ˈædənɔɪdz//
 
; NAmE NAmE//ˈædənɔɪdz//
 
[plural]
 
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pieces of soft tissue at the back of the nose and throat, that are part of the body’s immune system and that can swell up and cause breathing difficulties, especially in children Word Origin late 19th cent.: adenoid from Greek adēn ‘gland’ + -oid.
See the Oxford Advanced American Dictionary entry: adenoids