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protuberance

noun [C]
 
 
/prəˈtjuː.bər.əns/ US  /-ˈtuː-/ formal

Definition

something that sticks out from a surface: If the plant has been infected you will see dark protuberances along the stems.Protruding and sticking outSwellings and lumps
(Definition of protuberance noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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