Definition of filon in English:

filon

noun

Mining
rare
  • A vein of a mineral or metal, a lode; (in later use) specifically a vein that has formed in a fracture of a pre-existing body of rock.

Origin

Early 19th century. From French filon vein, lode from fil thread + -on.

Pronunciation

filon

/ˈfiːlɒ̃/