White-phosphorus meaning

A highly unstable, waxy white or yellowish allotrope of phosphorus, P4 , that spontaneously ignites upon exposure to oxygen, used especially in bombs and artillery shells as an incendiary agent or to produce a smoke screen.
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(chemistry) The most common allotrope of phosphorus; a yellow-white waxy solid that is insoluble in water and spontaneously combusts on exposure to air to form clouds of phosphorus pentoxide; used as a military smokescreen and as an incendiary weapon.
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