Dross is a mass of solid impurities floating on a molten metal bath. Dross (slang) has been used to describe persons of contemptible status. For example 'Human dross' is synonymous with 'Human scum'.
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A synanthrope (from ancient Greek σύν sýn "together, with" and ἄνθρωπος ánthrōpos "man") is an organism that evolve...
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