In chemistry, a solvent used to wash substances through a column or across a surface during separation processes.
From Latin 'eluent-' (present participle of 'eluere,' to wash out), composed of 'e-' (out) + 'luere' (to wash). The term entered scientific English in the 20th century for laboratory techniques.
The word 'eluent' is a beautiful example of how scientists resurrect old Latin words with precision — 'eluere' literally means to wash out, and that's exactly what an eluent does in chromatography, carrying dissolved substances along.
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