har·que·bus (här'kə-bəs, -kwə-) n. A heavy portable matchlock gun invented during the 15th century. Also called hackbut.
[Obsolete French harquebuse, from Old French, alteration of Middle Dutch hakebus : hake, hook; see keg- in Indo-European roots + busse, gun (from Late Latin buxis, box; see box1).]