Definition of astrophyllite in US English:

astrophyllite

noun

Mineralogy
  • A yellow to brownish-red mineral typically occurring as thin, elongated crystals, often in star-shaped aggregates.

Origin

Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From astro- + -phyllite, after German Astrophyllit.

Pronunciation

astrophyllite

/əˈstrɒfɪlʌɪt/