Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: protuberant, from Latin, present participle of protuberare, from tuber 'swelling'

protuberance

 noun
     
pro‧tu‧be‧rance [countable]
formal something that sticks out:
This dinosaur is recognizable by the protuberance on the top of its head.
—protuberant adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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