Definition of metallocene in English:

metallocene

Pronunciation /mɪˈtalə(ʊ)siːn/

noun

Chemistry
  • Any of a group of organometallic compounds that consist of a metal atom bonded between two cyclopentadienyl (or similar aromatic) rings in a sandwich structure, used especially as catalysts in polymer synthesis.

Origin

1950s; earliest use found in Journal of the American Chemical Society.