Definition of variolite in English:

variolite

noun

Geology
  • A fine-grained igneous rock, often basaltic or andesitic, containing spherical or ovoid crystalline masses (typically pale and several millimetres in diameter) which give it a spotted or pockmarked appearance.

Origin

Late 18th century; earliest use found in The Monthly Review. From (i) Italian variolite.

Pronunciation

variolite

/ˈvɛːrɪəlʌɪt/