hydrosulfurous

or hy·dro·sul·phu·rous

[ hahy-droh-suhl-fyoo r-uh s, -druh-suhl-fer-uh s ]
/ ˌhaɪ droʊ sʌlˈfyʊər əs, -drəˈsʌl fər əs /

adjective

Origin of hydrosulfurous

First recorded in 1850–55; hydro-2 + sulfurous