phosphorous

adjective
phos·​pho·​rous | \ ˈfäs-f(ə-)rəs How to pronounce phosphorous (audio) ; fäs-ˈfȯr-əs How to pronounce phosphorous (audio) \

Definition of phosphorous

: of, relating to, or containing phosphorus especially with a valence lower than in phosphoric compounds

First Known Use of phosphorous

1788, in the meaning defined above

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The first known use of phosphorous was in 1788

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phosphorous

adjective
phos·​pho·​rous | \ ˈfäs-f(ə-)rəs; fäs-ˈfōr-əs How to pronounce phosphorous (audio) , -ˈfȯr- How to pronounce phosphorous (audio) \

Medical Definition of phosphorous

: of, relating to, or containing phosphorus especially with a valence lower than in phosphoric compounds

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