Involving or consisting of two molecules, especially in chemistry when describing reactions between two molecular entities.
From Latin 'di-' (two) plus 'molecular' (from molecule, from Latin 'moles' meaning mass). This technical term emerged in 19th-century chemistry to classify reaction types.
Chemistry needed a way to describe reactions happening between exactly two molecules, so scientists combined the prefix 'di-' with 'molecular' to create precise terminology—it's how scientists speak shorthand to mean something very specific.
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