# trimethylpentane

> English word · Noun

## Definitions
1. Any of several isomers of octane having three methyl groups attached to a pentane chain; especially isooctane, used as a standard for octane number

## Etymology
From trimethyl + pentane.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/trimethylpentane