# rutile

> English word · Noun · frequency rank #76,287

## Definitions
1. The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, TiO₂.

## Etymology
From Latin rutilus (“red”) because of its common color, named in 1803.

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