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[ree-nee-uh m] /ˈri ni əm/
noun, Chemistry.
a rare metallic element of the manganese subgroup: used, because of its high melting point, in platinum-rhenium thermocouples. Symbol: Re; atomic number: 75; atomic weight: 186.2.
Origin of rhenium
1920-25; < New Latin, equivalent to Latin Rhēn(us) Rhine + -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rhenium


a dense silvery-white metallic element that has a high melting point. It occurs principally in gadolinite and molybdenite and is used, alloyed with tungsten or molybdenum, in high-temperature thermocouples. Symbol: Re; atomic no: 75; atomic wt: 186.207; valency: –1 or 1–7; relative density: 21.02; melting pt: 3186°C; boiling pt: 5596°C (est)
Word Origin
C19: New Latin, from Rhēnus the Rhine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for rhenium

1925, Modern Latin, from Latin Rhenus "the river Rhine" (see Rhine) + element ending -ium. Coined by German chemists Walter Noddack and Ida Tacke.

Online Etymology Dictionary, © 2010 Douglas Harper
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rhenium in Medicine

rhenium rhe·ni·um (rē'nē-əm)
Symbol Re
A rare dense metallic element with a high melting point. Atomic number 75; atomic weight 186.2; melting point 3,186°C; boiling point 5,596°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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rhenium in Science
Symbol Re
A very rare, dense, silvery-white metallic element with a very high melting point. It is used to make catalysts and electrical contacts. Atomic number 75; atomic weight 186.2; melting point 3,180°C; boiling point 5,627°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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