Phosphorous



[fos-fer-uh s, fos-fawr-uh s, -fohr-] /ˈfɒs fər əs, fɒsˈfɔr əs, -ˈfoʊr-/

adjective, Chemistry.
1.
containing trivalent .
/ˈfɒsfərəs/
adjective
1.
of or containing phosphorus in the trivalent state
adj.

1777, “phosphorescent,” from phosphorus + -ous. The chemical sense (1794) is immediately from French phosphoreux.

phosphorous phos·pho·rous (fŏs’fər-əs, fŏs-fôr’əs)
adj.
Of, relating to, or containing phosphorus, especially with a valence of 3 or a valence lower than that of a comparable phosphoric compound.

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