Is “Firelock” a Scrabble word?
Yes
FIRELOCK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Firelock
noun
1.A form of gunlock, in which the priming is ignited by a spark.
2.A firearm using such a gunlock.