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ruth
Ruthene
ruthenic
ruthenious
ruthenium
rutherfordium
ruthless
rutilant
rutile
rutin
Rutschblock test
rutting
RV
rv
RW
rw
Rwanda
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rutile

rutile [ r tīl ]


noun 
Definition:
 
dark lustrous mineral: a dark reddish-brown or lustrous black titanium dioxide mineral forming needle-shaped crystals. Source: igneous and metamorphic rocks. Use: source of titanium.

[Early 19th century. Via French and German< Latin rutilus 'reddish']
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