Wiktionary
uranocene
n. (context chemistry English) The actinocene cyclooctatetraenide with chemical formula U(C8H8)2, one of the first organouranium compounds to be synthesized.
Wikipedia
Uranocene
Uranocene, U(CH), is an organouranium compound composed of a uranium atom sandwiched between two cyclooctatetraenide rings. It was one of the first organouranium compounds to be synthesized. It is a green air-sensitive solid that dissolves in organic solvents. Uranocene, a member of the " actinocenes," a group of metallocenes incorporating elements from the actinide series. It is the most studied bis[[Cyclooctatetraene|[8]annulene]]-metal system, although it has no practical applications.