thallium

Chemical element
Tl
Previous: mercury (Hg)
Next: lead (Pb)

Coined based on Ancient Greek θαλλός (thallós, “green branch”) (after the color of the radiation spectra), +‎ -ium.

• enPR: thăl'ēəm, IPA^(key): /ˈθæliəm/

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• Rhymes: -æliəm

thallium (countable and uncountable, plural thalliums)

2. A metallic chemical element (symbol Tl) with atomic number 81: a gray post-transition metal that discolors when exposed to air.
   • 2021 January 27, Li You, “Northwest China Reports Thallium Pollution in Yangtze Tributary”, in Bibek Bhandari, editor, Sixth Tone‎^[1], archived from the original on 27 January 2021‎^[2]:

     Environmental authorities in Lüeyang County, Shaanxi province, discovered excessive levels of thallium in two of the Jialing River’s upstream tributaries on Jan. 20, according to a statement Monday. The concentration of thallium that day was 170% higher than the standard for Qingni River, one of the upstream tributaries bordering Gansu province.

3. A single atom of this element.

• thallate

• crookesite
• hutchinsonite
• lorandite

• thallium on Wikipedia.Wikipedia

• tallium

thallium

1. thallium

Chemical element
Tl
Previous: kwik (Hg)
Next: lood (Pb)

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thallium n (uncountable)

1. thallium

• IPA^(key): /ta.ljɔm/

• Audio:

  (file)

thallium m (uncountable)

1. thallium

• → Turkish: talyum

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

Chemical element
Tl
Previous: hydrargyrum (Hg)
Next: plumbum (Pb)

• (Classical Latin) IPA^(key): /ˈtʰal.li.um/, [ˈt̪ʰälːʲiʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈtal.li.um/, [ˈt̪älːium]

thallium n (genitive thalliī); second declension

1. thallium

Second-declension noun (neuter).

• IPA^(key): [ˈðɑ˦ʎɔ˧m]

thallium n

1. (uncountable) thallium
2. A part of thallium