actinium

Borrowed from French actinium. actin- +‎ -ium.

• enPR: ăktĭn'ēəm, IPA^(key): /ækˈtɪniəm/

• Audio (Southern England):

  (file)

actinium (usually uncountable, plural actiniums)

1. A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

• aktinium

actinium

1. actinium

Borrowed from French actinium.

• IPA^(key): /ɑkˈti.ni.ʏm/

• Audio:

  (file)

• Hyphenation: ac‧ti‧ni‧um

actinium n (uncountable)

1. actinium [from ca. 1900]

• actinide

• IPA^(key): /ak.ti.njɔm/

• Audio:

  (file)

actinium m (uncountable)

1. actinium

• “actinium”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

From Ancient Greek ἀκτίς, ἀκτῖν- (aktís, aktîn-, “ray”).

• (Classical Latin) IPA^(key): /akˈtiː.ni.um/, [äkˈt̪iːniʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /akˈti.ni.um/, [äkˈt̪iːnium]

actīnium n (genitive actīniī); second declension

1. actinium

Second-declension noun (neuter).

First part actin- from Ancient Greek ἀκτίς (aktís, “ray, beam”), from Proto-Hellenic [Term?], from Proto-Indo-European *nókʷ-t-u-s ~ *n̥kʷ-t-éw-s, from *nókʷts (“night”), from *negʷ- (“bare, naked”). Last part from Latin -ium (forms names of chemical elements), from -ius (forms adjectives), from Old Latin -iōs, from Proto-Italic *-jos (forms comparative adverbs), from Proto-Indo-European *-yōs ~ *-is- (forms adjectives).

• IPA^(key): /akˈtiːnɪʉm/

• Audio:

  (file)

• Rhymes: -ʉm
• Hyphenation: ac‧ti‧ni‧um

actinium n (definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene)

1. (organic chemistry) actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores)
   • 2015, periodesystemet.no:

     actinium får nitrogenet i luften til å lyse blått

     actinium causes the nitrogen in the air to glow blue

• “actinium” in The Bokmål Dictionary.
• “actinium” in Det Norske Akademis ordbok (NAOB).
• “actinium” in Store norske leksikon