The French estoc or English "tuck" was a type of European thrusting sword in use from the 14th to 17th centuries.
Unlike the rapier, which was used mostly in a civilian context, the estoc more resembles traditional swords with a crossguard mainly due to its use as a battlefield implement for getting into the chinks of armor.
Usage
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This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.