Webster's English Dictionary

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rutile

ru.tile \'ru:-.te-l\ n [G rutil, fr.L rutilus reddish; akin to L ruger red 
   - more]at RED : a mineral TiO2 that consists of titanium dioxide usu. with 
   a littl e iron, is of a reddish brown color but when deep red or black is 
   sometimes cut into a gem, and has a brilliant metallic or adamantine luster