In chemistry, a solvent used in chromatography to wash substances through or off a column or medium.
From the verb 'elute' (from Latin 'eluere' meaning 'to wash out'), with the agent suffix '-ant,' creating a chemistry term for the liquid that performs the washing action.
Chemistry borrowed from Latin to create precise terms—'eluant' and 'eluent' (variants for the same thing) show how scientists use classical languages to avoid confusion, since Latin-derived words feel more 'official' than everyday English.
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