One of the mysteries of the English language finally explained.
1no object To be or become protuberant; to bulge out; to form a rounded prominence.
2with object To cause to bulge out or project. rare.
Late 16th century; earliest use found in John Banister (1532/3–?1610), surgeon. From post-classical Latin protuberat-, past participial stem of protuberare. Compare protuberated, protuberating.
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