amorphous phosphorus

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a·mor·phous phos·pho·rus

, red phosphorus
an allotropic form of phosphorus formed by heating ordinary phosphorus, in the absence of oxygen, to 260°C; it occurs as an amorphous dark-red mass or powder, nonpoisonous and much less flammable than ordinary phosphorus; it may be reconverted to the latter by heating to 454.4°C in nitrogen gas.