hyposulfurous

[hahy-puh-suhl-fyoo r-uh s, -suhl-fer-uh s] /ˌhaɪ pə sʌlˈfyʊər əs, -ˈsʌl fər əs/
adjective
1.
of or derived from hyposulfurous acid.
Also, hydrosulfurous, hyposulphurous.
Origin
1810-20; hypo- + sulfurous