Definify.com
Webster 1913 Edition
Firelock
Fire′lockˊ
,Noun.
 An old form of gunlock, as the flintlock, which ignites the priming by a spark; perhaps originally, a matchlock. Hence, a gun having such a lock. 
Webster 1828 Edition
Firelock
FI'RELOCK
,Noun.
  Definition 2025
firelock
firelock
English
Noun
firelock (plural firelocks)
-  An old form of gunlock, as the flintlock, which ignites the priming by a spark.
-  1819, Washington Irving, The Sketch Book, Rip Van Winkle:
- He looked round for his gun, but … he found an old firelock lying by him, … He now suspected that the grave roysters of the mountain had put a trick upon him, ….
 
 -  1824, Town and Country Tales (page 115)
- Alfred, surprised to meet his father, whom he thought absent from home, […] stood, holding his firelock in one hand, and his hat in the other […]
 
 
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References
- firelock in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913