Rous·sin's salt
| \ ˈrüsə̇nz- \
Definition of Roussin's salt
: any of two series of alkali metal salts that are nitrosyl and sulfur complexes of iron:
a
: a red unstable salt having the general formula M[Fe(NO)2S] and obtainable by reaction of nitric oxide with ferrous sulfide
b
: a black more stable salt having the general formula M[Fe4(NO)7S3] and obtainable (as by treatment with alkali) from a red salt
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“Roussin's salt.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Roussin%27s%20salt. Accessed 27 Jan. 2022.
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