Definition of acmite in English:

acmite

noun

Mineralogy
  • An iron-containing mineral of the pyroxene group, which occurs as dark green, pointed crystals.

Origin

Early 19th century. Originally from Swedish Achmit from Greek ἀχμή, supposed variant of ancient Greek ἀκμή point + -it, so called on account of the shape of its crystals. In later use altered after ancient Greek ἀκμή.

Pronunciation:

acmite

/ˈakmʌɪt/