rubidium, Rb, atomic number
(noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
Source: WordNet® 3.1
rubidium (usually uncountable, plural rubidiums)
The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
(countable) A single atom of this element.
Source: Wiktionary
Ru*bid"i*um, n. Etym: [NL., fr. L. rubidus red, fr. rubere to be red. So called from two dark red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia. See Rubicund.] (Chem.)
Definition: A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2.
Source: Webster’s Unabridged Dictionary 1913 Edition
2 January 2025
(adjective) being the one previously mentioned or spoken of; “works of all the aforementioned authors”; “said party has denied the charges”
According to Guinness World Records, on 25 September 2016, the Birla Institute of Management Technology (India) in Uttar Pradesh, India, constructed the largest coffee cups pyramid consisting of 23,821 cups. They used paper takeaway coffee cups to build the pyramid.
