Definition of melilite in US English:

melilite

(also mellilite)

noun

Mineralogy
  • A tetragonal silicate of calcium and aluminium, occurring as honey-yellow crystals in igneous and metamorphic rocks and many slags. Also: any of a group of related minerals which includes this species, having the general formula A₂BZSiO₇ (where A = Na or Ca, B = Al, Be, Mg, or Zn, and Z = Al or Si).

Origin

Early 19th century; earliest use found in Arthur Aikin (1773–1854), natural scientist and author. From French mélilite (J. C. de la Métherie Théorie de la Terre II. 273) from ancient Greek μέλι honey + French -lite.

Pronunciation

melilite

/ˈmɛlɪlʌɪt/