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



RESET




Word of the Day

1 March 2025

AROMATIC

(adjective) (chemistry) of or relating to or containing one or more benzene rings; “an aromatic organic compound”


coffee icon

Coffee Trivia

In the 16th century, Turkish women could divorce their husbands if the man failed to keep his family’s pot filled with coffee.

coffee icon