Definition of pentahydrite in US English:

pentahydrite

noun

Mineralogy
  • A magnesium-containing mineral which occurs as massive, granular, white to light blue crystals.

Origin

1950s. From pentahydr- + -ite; coined by C. Frondel in 1948.

Pronunciation

pentahydrite

/ˌpɛntəˈhʌɪdrʌɪt/