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hydrosulfurous

or hy·dro·sul·phu·rous

[hahy-droh-suhl-fyoo r-uh s, -druh-suhl-fer-uh s]
See more synonyms for hydrosulfurous on Thesaurus.com
adjective
  1. hyposulfurous.
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Origin of hydrosulfurous

First recorded in 1850–55; hydro-2 + sulfurous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018