Definition of red stone in English:

red stone

noun

  • 1Alchemy. The red form of the philosopher's stone. Now historical.

  • 2Now usually in form redstone. Any of various rocks of a red colour, especially a sandstone or other reddish sedimentary rock suitable for use as a building stone.

Origin

Old English (in an earlier sense). From red + stone.

Pronunciation

red stone

/ˈrɛd ˌstəʊn/