pentamethyl

P3E1N1T1A1M3E1T1H4Y4L1

noun

five methyl groups in a molecule

OriginEnglish methyl ← German Methy ← Ancient Greek ῡ̔́λη (hū́lē) →
Scrabble 21
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Meanings

nounpentamethyl (uncountable)
  1. in compoundsuncountablechemistryfive methyl groups in a molecule

Origin

  1. Proto-Indo-European*pénkʷe
  2. Proto-Hellenic*pénkʷe
  3. Ancient Greekπέντε (pénte)
  4. Ancient Greekπεντᾰ- (pentă-)
  5. Englishpenta-
  6. Proto-Indo-European*médʰu
  7. Proto-Hellenic*métʰu
  8. Ancient Greekμέθυ (méthu)
  9. Proto-Indo-European*swel-der.?
  10. Ancient Greekῡ̔́λη (hū́lē)
  11. GermanMethy
  12. Englishmethyl
  13. Englishpentamethyl

From penta- + methyl.

Full word history & related roots →
Cite this entry
APA

pentamethyl. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/pentamethyl

MLA

“pentamethyl.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pentamethyl. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “pentamethyl,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/pentamethyl.

Source: pentamethyl on Wiktionary, CC BY-SA 4.0.