1Attributive Designating or relating to a firearm designed by Minié; (also) to an elongated bullet invented by Minié, which when fired is expanded by powder contained in an iron cup inserted in a cavity at its base. Especially in "Minié ball", "Minié rifle".
2A Minié bullet; a Minié rifle.
Mid 19th century; earliest use found in The Daily News. From the name of Captain Claude-Étienne Minié, French soldier, who invented the Minié bullet in 1849.