• synonyms


[roo-teel, -tahyl]
  1. a common mineral, titanium dioxide, TiO2, usually reddish-brown in color with a brilliant metallic or adamantine luster, occurring in crystals: used to coat welding rods.
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Origin of rutile

1795–1805; < French < German Rutil < Latin rutilus red1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rutile

Historical Examples of rutile

  • Rutile is much lighter, 4·2, and the streak light-brown; tourmaline is only 3·2.

    Getting Gold

    J. C. F. Johnson

  • The principal titanium minerals are rutile (titanium oxide) and ilmenite (iron titanate).

  • Rutile and ilmenite both have high specific gravity and are little affected by weathering.

  • There is no distinct cleavage (rutile and anatase have cleavages); hardness 5-6; sp.

  • Minute crystals of brookite have been detected with anatase and rutile in the iron-ore of Cleveland in Yorkshire.

British Dictionary definitions for rutile


  1. a black, yellowish, or reddish-brown mineral, found in igneous rocks, metamorphosed limestones, and quartz veins. It is a source of titanium. Composition: titanium dioxide. Formula: TiO 2 . Crystal structure: tetragonal
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Word Origin for rutile

C19: via French from German Rutil, from Latin rutilus red, glowing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

rutile in Science


[rōōtēl′, -tīl′]
  1. A lustrous red, reddish-brown, or black tetragonal mineral that is an ore of titanium. Rutile usually occurs as prismatic crystals in other minerals, especially as dark needlelike crystals in quartz. Chemical formula: TiO2.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.