Definition of portfire

: a fuze or match for firing guns or fireworks: such as
a : a paper case filled with a composition of niter, sulfur, and mealed powder
b : a slow-burning fuze (as a billet of wood impregnated with potassium nitrate) or an incendiary cord or tube for igniting fuzes of blasting charges

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History and Etymology for portfire

partial translation of French porte-feu from porter to carry + feu fire

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suitable to be imparted to the public

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