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1640s, from Late Latin protuberantem (nominative protuberans), present participle of protuberare "to swell, bulge, grow forth," from Latin pro- "forward" (see pro-) + tuber "lump, swelling" (see tuber).
protuberance pro·tu·ber·ance (prō-tōō'bər-əns, -tyōō'-, prə-)n.
Something, such as a bulge, knob, or swelling, that protrudes.
The condition of being protuberant.