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phosphorus - (n) - the chemical element of atomic number 15, a poisonous, combustible nonmetal which exists in two common allotropic forms, white phosphorus, a yellowish waxy solid which ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches

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Phossy jaw was a horrfying industial poisoning, also called phosphorus necrosis of the jaw, caused by exposure to white phosphorus.