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residuum

Pronunciation: /rɪˈzɪdjʊəm/
Definition of residuum

noun (plural residua /-djʊə/)

  • 1 technical a chemical residue.
  • 2 Sociology a class of society that is unemployed and without privileges or opportunities: the urban residuum

Origin:

late 17th century: from Latin, neuter of residuus 'remaining', from the verb residere

residuum in other Oxford dictionaries

Definition of residuum in the US English dictionary