Definition of malthacite in English:

malthacite

(also malthazite)

noun

Mineralogy
historical
  • A white or yellowish clay similar to fuller's earth, usually occurring as scales.

Origin

Mid 19th century; earliest use found in Henry Watts (1815–1884), chemist. From German Malthacit from ancient Greek μαλθακός soft + German -it.

Pronunciation

malthacite

/ˈmalθəsʌɪt/