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Webster 1913 Edition

Noun.

A lock for a gun or pistol, having a flint fixed in the hammer, which on striking the steel ignites the priming.

A hand firearm fitted with a flintlock; esp., the old-fashioned musket of European and other armies.

flintlock ‎(plural flintlocks)

An early type of firearm, using a spring-loaded flint to strike sparks into the firing pan.
- 1879, Richard Jefferies, The Amateur Poacher, chapter1:
  But then I had the flintlock by me for protection. ¶ There were giants in the days when that gun was made; for surely no modern mortal could have held that mass of metal steady to his shoulder. The linen-press and a chest on the top of it formed, however, a very good gun-carriage; and, thus mounted, aim could be taken out of the window, […].

firearm