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From The Collaborative International Dictionary of English v.0.48:
Arquebus \Ar"que*bus\, Arquebuse \Ar"que*buse\ (?; 277), n. [F. arquebuse, OF. harquebuse, fr. D. haak-bus; cf. G. hakenb["u]chse a gun with a hook. See Hagbut.] A sort of hand gun or firearm; a contrivance answering to a trigger, by which the burning match was applied. The musket was a later invention. [Written also harquebus.] [1913 Webster]