Rutile definitions

ro͝o'tēl', -tīl'
A lustrous red, reddish-brown, or black mineral, TiO2 , used as a gemstone, as an ore, and in paints and fillers.
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A hard, reddish, tetragonal form of titanium dioxide, an ore of titanium.
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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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(mineralogy) The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, TiO2.
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Origin of rutile

French from German Rutil from Latin rutilus red rutilant