ACTINIUM
actinium, Ac, atomic number
(noun) a radioactive element of the actinide series; found in uranium ores
Source: WordNet® 3.1
Etymology
Noun
actinium (uncountable)
a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores
Source: Wiktionary
Ac*tin"i*um, n. Etym: [Gr. (Chem.)
Definition: A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.
Source: Webster’s Unabridged Dictionary 1913 Edition
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Word of the Day
1 June 2025
BACKFIRE
(verb) come back to the originator of an action with an undesired effect; “Your comments may backfire and cause you a lot of trouble”; “the political movie backlashed on the Democrats”
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