Definition of rhyodacite in English:

rhyodacite

noun

Geology
  • A relatively light-coloured, extrusive volcanic rock with a fine-grained porphyritic texture, intermediate in composition between rhyolite and dacite.

Origin

Early 20th century. From rhyo- + dacite.

Pronunciation

rhyodacite

/rʌɪəˈdeɪsʌɪt/