Run.
/ˌɑːˈjuː/, U.S. /ˌɑrˈju/ Chemistry.
The element ruthenium.
ΚΠ
1842 W. T. Brande Dict. Sci., Lit. & Art at Symbols, Chemical Ruthenium... Ru.
1877 H. Watts Fownes's Man. Elem. Chem. I. 268 Ru and Os form tetroxides..and may therefore be regarded as octads.
1915 Chem. Abstr. 9 419 From Pt alone Ru can be sepd. by the NaClO method given above.
1951 Proc. Royal Soc. A. 208 440 The fall in melting point on passing from Mo → Ru, and from W → Re → Os suggests that in the metallic state a decrease in valency occurs after Group VI.
2005 H. F. Braun in A. V. Narlikar Frontiers Superconducting Materials 370 Superconductivity was not observed..in the pure Ru compound.
This is a new entry (OED Third Edition, March 2011; most recently modified version published online March 2022).
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