Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry the bicyclic hydrocarbon formed from two cyclopentadiene rings linked with a double bond; any derivative of this compound
  • noun chemistry any heterocyclic analogue of these compounds

Etymologies

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Examples

  • One of the best examples in recent years, tetracarbonly-diruthenium fulvalene, requires the use of ruthenium, which is rare and expensive.

    Wired Top Stories Ars Technica 2011

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