noun Date: 1670 a gun's lock for a muzzle-loading firearm in which sparks are struck from a flint or a piece of pyrite by a revolving wheel
WHEEL LOCK
Meaning of WHEEL LOCK in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012