Definition of water sapphire in English:

water sapphire

noun

  • A translucent blue variety of cordierite (iolite); = "saphir d'eau".

Origin

Late 17th century; earliest use found in John Fryer (d. 1733), traveller and writer. From water + sapphire.

Pronunciation

water sapphire

/ˈwɔːtə ˌsafʌɪə/