phos·pho·rous
ˈfäs-f(ə-)rəs
fäs-ˈfȯr-əs
: of, relating to, or containing phosphorus especially with a valence lower than in phosphoric compounds
phosphorous
2 of 2less common spelling of phosphorus sense 2
Cite this Entry
“Phosphorous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phosphorous. Accessed 1 Sep. 2026.
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