isooctane

I1S1O1O1C3T1A1N1E1

noun

any isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel

OriginEnglish octane ← Ancient Greek ῐ̓́σος (ĭ́sos) →
Scrabble 11
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

nounisooctane (countable and uncountable, plural isooctanes)

plural isooctanes

  1. countableuncountablechemistryany isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel

Origin

  1. Ancient Greekῐ̓́σος (ĭ́sos)
  2. Englishiso-
  3. Englishoctane
  4. Englishisooctane

From iso- + octane.

Full word history & related roots →
Cite this entry
APA

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

MLA

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

Chicago

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

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