a small amount of something that remains after the main part has been removed
From Old French 'residu,' from Latin 'residuum' (remainder), from 'residere' (to remain behind)
Residue comes from Latin 'to remain behind' - it's what gets left behind when everything else moves on. Whether it's soap residue on dishes or emotional residue from an argument, it's always the stubborn bit that lingers!
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