Definition of residuum in English:

residuum

Line breaks: re|siduum
Pronunciation: /rɪˈzɪdjʊəm
 
/

noun (plural residua /-djʊə/)

1 technical A chemical residue.
More example sentences
  • But figuring out exactly how to regenerate ammonia borane from the residuum left after hydrogen has been extracted remains a stumbling block.
  • The barite ore is massive and occurs within residuum derived from carbonate units.
  • Type I peridotites are interpreted to be the residua remaining after extraction of a partial melt.
2 Sociology A class of society that is unemployed and without privileges or opportunities: the urban residuum
More example sentences
  • Examples would be vagrants, skid-row alcoholics, the unemployed or casually employed residuum, youth adopting a deviant cultural style, ethnic minorities, gays, prostitutes and radical political organizations.
  • Whereas the incorporation of the working class modified their systematic resentment at policing, police conflict with the residuum at the base of the social hierarchy remained.
  • Though the residuum is in one sense a social category, the concept implies that the group stands outside society and resists easy categorization.

Origin

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

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