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Definition of Portfire
1. n. A case of strong paper filled with a composition of niter, sulphur, and mealed powder, -- used principally to ignite the priming in proving guns, and as an incendiary material in shells.
Definition of Portfire
1. Noun. A case of strong paper filled with a composition of nitre, sulphur, and mealed powder, used principally to ignite the priming in proving guns, and as an incendiary material in shells. ¹
¹ Source: wiktionary.com