phosphorous

(fäsfə rəs, fäs fôrəs)

adjective

  1. phosphorescent
  2. Origin: Fr phosphoreux

    of, like, or containing phosphorus, esp. trivalent phosphorus

Origin: phosphor(us) + -ous

See phosphorous in American Heritage Dictionary 4

adjective
Of, relating to, or containing phosphorus, especially with valence 3 or a valence lower than that of a comparable phosphoric compound.

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