cyclopentadienyl
noun
cyclopentadienyl is a noun meaning “The univalent anion derived from cyclopentadiene; contains a ring of delocalized electrons; forms metallocene compounds with transition metals” (English Wiktionary, September 2026). It is spelled C-Y-C-L-O-P-E-N-T-A-D-I-E-N-Y-L, and it appears about once in every 38 million words in written English (wordfreq, 2021 data). The plural of cyclopentadienyl is cyclopentadienyls.
What does cyclopentadienyl mean?
noun
- 1
The univalent anion derived from cyclopentadiene; contains a ring of delocalized electrons; forms metallocene compounds with transition metals.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of cyclopentadienyl
- cyclopentadienyls plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is cyclopentadienyl?
Cyclopentadienyl appears about once in every 38 million words in written English, the 189,524th 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).
Where does cyclopentadienyl come from?
From cyclopentadiene + -yl.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).