An archaic or variant spelling of ethylsulphuric, relating to compounds containing ethyl and sulfuric acid components.
Variant of ethylsulphuric; this spelling appears in older chemical texts but is now considered non-standard. The 'y' for 'yl' represents an older chemical naming convention.
Chemical names change as the science gets better—ethysulphuric shows how even the way we spell chemical terms evolves, making chemistry's history visible in old textbooks.
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