mammatus
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mam·ma·tus
(mə-măt′əs, -mä′təs, -mā′-, măm′ə-təs)adj.
A cloud formation consisting of rounded, usually smooth protuberances that appear to hang down from the base of cumulonimbus or other clouds.
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.
mammatus
(mæˈmeɪtəs)n
(Physical Geography) a bumpy, breast-shaped cloud
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014