Definition of miarolitic in US English:

miarolitic

adjective

Geology
  • Of an igneous rock or its structure: characterized by irregular cavities into which crystals project.

Origin

Late 19th century; earliest use found in Quarterly Journal of the Geological Society of London. From German miarolit- (in miarolitisch from Miarolit a type of granite + -isch) + -ic. German Miarolit is from Italian (northern) miarolo a type of granite from the Lake Maggiore area in northern Italy (from Italian regional (Lombardy) miaroeu granite) + German -lit.

Pronunciation

miarolitic

/ˌmiːərə(ʊ)ˈlɪtɪk/