https://en.wiktionary.org/wiki/protuberance
protuberance - Wiktionary, the free dictionary
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https://www.merriam-webster.com/dictionary/protuberance
PROTUBERANCE Definition & Meaning - Merriam-Webster
The meaning of PROTUBERANCE is something that is protuberant. How to use protuberance in a sentence. Synonym Discussion of Protuberance.
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https://en.wikipedia.org/wiki/Inion
External occipital protuberance - Wikipedia
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