polonium, Po, atomic number
(noun) a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
Source: WordNet® 3.1
polonium (usually uncountable, plural poloniums)
A rare, highly radioactive chemical element (symbol Po) with atomic number 84.
• chalcogen
Source: Wiktionary
Po*lo"ni*um, n. [NL. So named after Poland, in L. form Polonia, one of the discoverers being a Pole.] (Chem.)
Definition: A supposed new element, a radioactive substance discovered by M. and MMe. Curie in pitchblende. It is closely related chemically to bismuth. It emits only alpha rays and is perhaps identical with radium F.
Source: Webster’s Unabridged Dictionary 1913 Edition
2 April 2025
(adjective) secret or hidden; not openly practiced or engaged in or shown or avowed; “covert actions by the CIA”; “covert funding for the rebels”
Decaffeinated coffee is not caffeine-free. Studies from the National Institute of Health (US) have shown that virtually all decaf coffee types contain caffeine. A 236-ml (8-oz) cup of decaf coffee contains up to 7 mg of caffeine, whereas a regular cup provided 70-140 mg.
