protuberation
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pro·tu·ber·ate
(prō-to͞o′bə-rāt′, -tyo͞o′-, prə-)intr.v. pro·tu·ber·at·ed, pro·tu·ber·at·ing, pro·tu·ber·ates
To swell or bulge.
[Late Latin prōtūberāre, prōtūberāt- : Latin prō-, forth; see pro-1 + Latin tūber, a swelling; see teuə- in Indo-European roots.]
pro·tu′ber·a′tion n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
protuberation
(prəˌtjuːbəˈreɪʃən)n
another word for protuberance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014