cyclopentadiene
noun
cyclopentadiene is a noun meaning “an unsaturated alicyclic hydrocarbon, C₅H₆; it forms complexes with some transition elements” (English Wiktionary, September 2026). It is spelled C-Y-C-L-O-P-E-N-T-A-D-I-E-N-E, and it appears about once in every 63 million words in written English (wordfreq, 2021 data). The plural of cyclopentadiene is cyclopentadienes.
What does cyclopentadiene mean?
noun
- 1
an unsaturated alicyclic hydrocarbon, C₅H₆; it forms complexes with some transition elements
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of cyclopentadiene
- cyclopentadienes plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is cyclopentadiene?
Cyclopentadiene appears about once in every 63 million words in written English, the 249,463rd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Cyclopentadiene in Spanish, French, German and Portuguese
In the sense cyclopentadiene:
| Language | Words |
|---|---|
| French | cyclopentadiène |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.