Having two acidic properties or containing two acid groups; used in chemistry and chemistry-related contexts.
From Latin prefix 'bi-' (two) plus 'acid' (sour, from Latin 'acere' to be sour). The term emerged in 19th-century chemistry to describe molecules with two separate acidic functional groups.
Chemists love the 'bi-' prefix for describing molecules with exactly two of something—biacid, bibasic, bivalent—it's like they created a whole counting system from Latin prefixes!
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