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rheotaxis
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rhenium

rhe·ni·um [ rnee əm ]


noun 
Definition:
 
rare heavy metallic element: a rare heavy silvery white metallic element with a high melting point. Source: molybdenite. Use: catalyst, with tungsten in thermocouples.
Symbol  Re


[Early 20th century. < German< Latin Rhenus "the Rhine"]
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