Definition of residuum in US English:

residuum

noun

technical
  • A substance or thing that remains or is left behind, in particular, a chemical residue.

    • ‘These soils are moderately deep to deep, well-drained loam or silt loam surface soils with loam or silty clay loam subsoils, formed primarily in sandstone residuum.’
    • ‘Type I peridotites are interpreted to be the residua remaining after extraction of a partial melt.’
    • ‘The barite ore is massive and occurs within residuum derived from carbonate units.’
    • ‘After evaluation of the residuum and comparison with a threshold value, a fault signal is generated when the residuum reaches the threshold value.’
    • ‘But figuring out exactly how to regenerate ammonia borane from the residuum left after hydrogen has been extracted remains a stumbling block.’
    remainder, remaining part, part leftover, rest, remnant, remnants
    View synonyms

Origin

Late 17th century: from Latin, neuter of residuus ‘remaining’, from the verb residere.

Pronunciation

residuum

/rəˈzɪdʒəwəm//rəˈzijəwəm/