MATRICE, or matrices, used by the letter-founders, are those little pieces of copper or brass, at one end whereof are engraven, dentwise, or en creux, the several characters used in the composing of books. Each character, virgula, and even each point in a discourse, has its several matrix; and of consequence its several puncheon to strike it. Matrices are cut or graven by engravers in metal.
When types are to be cast, the matrice is fastened to the end of the mould, so disposed, as that when the metal is poured on it, it may fall into the creux or cavity of the matrice, and take the figure and impression thereof. See Letter Foundry.