Definition of microdiorite in English:

microdiorite

noun

Geology
  • Any medium-grained or microcrystalline rock whose mineral composition is the same as that of a diorite.

Origin

1920s; earliest use found in Arthur Holmes (1890–1965), geologist and geophysicist. From micro- + diorite.

Pronunciation

microdiorite

/ˌmʌɪkrə(ʊ)ˈdʌɪərʌɪt/