Plural of dioxid; the older spelling variant of 'dioxides,' referring to multiple chemical compounds with two oxygen atoms.
From 'dioxid' (older spelling) + '-s.' This represents historical chemical nomenclature before modern standardization unified the spelling as 'dioxide.'
Old chemistry textbooks from the 1800s and early 1900s are full of 'dioxids' instead of 'dioxides'—it's like reading the evolution of how scientists slowly agreed on spelling!
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