Etymology
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firelock (n.)

type of gun lock that uses sparks to ignite the priming, 1540s, from fire (n.) + lock (n.1). Originally of the wheel-lock; transferred 17c. to the flintlock.

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Definitions of firelock

firelock (n.)
a muzzle loader that had a flintlock type of gunlock;
Synonyms: flintlock
From wordnet.princeton.edu