rubidium means the chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
Among words judged in Lexicurio's Arena, rubidium ranks #3,411 of 42,747 for Qualifying.
rubidium is pronounced /ˌɹuːˈbɪd.i.əm/.
Etymology
A New Latin word derived by German chemist R. W. Bunsen in 1861, from Latin rūbidus (“red”) because its spectrum has two red lines.
noun
- The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
- A single atom of this element.
Definitions & examples from Wiktionary (CC BY-SA 3.0).