1) Arquebus 2) Hackbut 3) Harquebus 4) Muzzle loader 1) Arquebus 2) Hackbut 3) Harquebus 
• (n.) A harquebus, of which the but was bent down or hooked for convenience in taking aim.
Hag'but (-bŭt) noun [ Old French haquebute , probably a corruption of Dutch haakbus ; haak hook + bus gun barrel. See Hook , and 2d Box , and confer Arquebus .] A harquebus, of which the but was bent down or hooked for convenience in taking aim....