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.]

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]