Definition of oncosine in English:

oncosine

(also onkosine)

noun

Mineralogy
historical
  • An aluminosilicate of potassium, other alkali metals, and magnesium which is a variety of, or perhaps a mixture containing, muscovite.

Origin

Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Onkosin from ancient Greek ὄγκωσις swelling, in allusion to its behaviour when heated in a blowpipe flame + German -in.

Pronunciation

oncosine

/ˈɒŋkə(ʊ)siːn/