Definition of "rutile" [ru•tile]

• A lustrous red, reddish-brown, or black mineral, TiO2, used as a gemstone, as an ore, and in paints and fillers. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The star sapphire does, not the rutile that causes it."
• "A recent increase in political stability has led to a revival of economic activity such as the rehabilitation of bauxite and rutile mining."
• "Most heavy-mineral sands also have a high content of titanium-bearing minerals, such as ilmenite and rutile."