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1. A cluster of small iron balls or other small projectiles, often contained in a canvas bag, that scatter when fired from a cannon, formerly used as an antipersonnel round.
2. Such balls or projectiles considered as a group.
[From its resemblance to a cluster of grapes.]
(Firearms, Gunnery, Ordnance & Artillery) ammunition for cannons consisting of a canvas tube containing a cluster of small iron or lead balls that scatter after firing
a cluster of small cast-iron balls formerly used as a charge for a cannon.