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1. Oxford Dictionary

   phosphorus

   • IPA[ˈfɒsf(ə)rəs]

   英式

   • n.
     the chemical element of atomic number 15, a poisonous, combustible non-metal 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.

   • noun: phosphorus