Definition of elvan in English:

elvan

noun

mass nounGeology
  • Hard intrusive igneous rock found in Cornwall, typically quartz porphyry.

    ‘Less frequently elvan has been met with in apparently isolated masses.’
    ‘Molybdenite and corundum are also found in the schist through which the elvan dykes have cut.’

Origin

Early 18th century perhaps via Cornish from Welsh elfen ‘element’.

Pronunciation

elvan

/ˈɛlv(ə)n/