minié ball

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min·ié ball

 (mĭn′ē, mĭn′ē-ā′)
A conical rifle bullet used in the 1800s and designed with a hollow base that expanded when fired.

[After Claude Étienne Minié (1814?-1879), French army officer.]
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.

Minié ball

(ˈmɪnɪˌeɪ; French miɲe)
(Firearms, Gunnery, Ordnance & Artillery) a conical rifle bullet, used in the 19th century, manufactured with a hollow base designed to expand when fired to fit the rifling
[C19: named after Capt C. E. Minié (1814–1879), French army officer who invented it]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014