A chemical compound containing two sulfide groups; an older or variant name for bisulfide.
From bi- (two) + sulfid (variant of sulfide, from sulfur + -ide). This is an archaic or variant spelling used in older chemical literature.
Old chemistry textbooks use 'bisulfid' while modern ones use 'bisulfide'—the '-ide' ending won and '-id' faded away, showing how chemistry standardized its language in the 20th century to avoid confusion.
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