In chemistry, describing a compound in which two atoms or groups have been substituted for two other atoms or groups in the original molecule.
From di- (two) + substituted (from Latin substituere: sub- 'under' + statuere 'to place'). This is scientific terminology combining numerical Greek prefix with chemical concepts.
Chemists use di-, tri-, tetra- prefixes constantly because they're unambiguous—when a molecule is 'disubstituted,' everyone knows exactly two replacements happened, making it perfect for precision science.
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