Definition of greystone in English:

greystone

noun

  • (A) A building stone of a grey colour. (b) Geology. A grey volcanic rock composed of feldspar (sometimes replaced by leucite or melilite) and augite or hornblende (now chiefly historical).

Origin

Late 18th century. From grey + stone.

Pronunciation

greystone

/ˈɡreɪstəʊn/