dubnium, Db, hahnium, element, atomic number
(noun) a transuranic element
Source: WordNet® 3.1
dubnium (uncountable)
A transuranic chemical element (symbol Db) with atomic number 105.
(chemistry, obsolete) A rejected name for rutherfordium.
• eka-tantalum (used before the element was discovered)
• hahnium (proposed by American scientists, but rejected; still used by some Western scientists; see also hassium)
• joliotium (proposed by the IUPAC, but rejected)
• nielsbohrium (proposed by Russian scientists, but rejected)
• unnilpentium (used before the element had been officially named to avoid disputes between Western and Russian scientists over "hahnium" and "dubnium" respectively)
Source: Wiktionary
25 June 2024
(noun) any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
The first coffee-house in Mecca dates back to the 1510s. The beverage was in Turkey by the 1530s. It appeared in Europe circa 1515-1519 and was introduced to England by 1650. By 1675 the country had more than 3,000 coffee houses, and coffee had replaced beer as a breakfast drink.
