Meanings
plural thalliums
- countableuncountablechemistryA metallic chemical element (symbol Tl) with atomic number 81: a gray post-transition metal that discolors when exposed to air.
1 more example
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.
2021 January 27, Li You, “Northwest China Reports Thallium Pollution in Yangtze Tributary”, in Bibek Bhandari, editor, Sixth Tone, archived from the original on 27 Jan 2021- countablechemistryAn atom of this element.
Synonyms & antonyms
nouna soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Ancient Greekθαλλός“green branch”
- Englishthallium
Coined based on Ancient Greek θαλλός (thallós, “green branch”) (after the color of the radiation spectra), + -ium.
More words from Ancient Greek
Full word history & related roots →Translations
Afrikaans tallium
- talliumchemical element
Arabic ثَالِيُوم
- ثَالِيُوم (ṯāliyūm)chemical element
Basque talioa
- talioachemical element
Bulgarian та́лий
- та́лий (tálij)chemical element
Catalan tal·li
- tal·lichemical element
Chinese Mandarin 鉈 /铊
- 鉈 /铊 (tā)chemical element
Czech thallium
- thalliumchemical element
Danish thallium
- thalliumchemical element
Dutch thallium
- thalliumchemical element
Esperanto talio
- taliochemical element
Estonian tallium
- talliumchemical element
Finnish tallium
- talliumchemical element
French thallium
- thalliumchemical element
German Thallium
- Thalliumchemical element
Greek θάλλιο
- θάλλιο (thállio)chemical element
Hebrew תליום
- תליום (tályum)chemical element
Hindi सिक्ष्यातु
- सिक्ष्यातु (sikṣyātu)chemical element
Hungarian tallium
- talliumchemical element
Icelandic þallín
- þallínchemical element
Irish tailliam
- tailliamchemical element
Italian tallio
- talliochemical element
Japanese タリウム
- タリウム (tariumu)chemical element
Korean 탈륨
- 탈륨 (tallyum)chemical element
Latin thallium
- thalliumchemical element
Latvian tallijs
- tallijschemical element
Lithuanian talis
- talischemical element
Malay talium
- taliumchemical element
Norwegian thallium
- thalliumchemical element
Polish tal
- talchemical element
Portuguese tálio
- táliochemical element
Romanian taliu
- taliuchemical element
Russian та́ллий
- та́ллий (tállij)chemical element
Scottish Gaelic tailliam
- tailliamchemical element
Slovak tálium
- táliumchemical element
Spanish talio
- taliochemical element
Swedish tallium
- talliumchemical element
Tamil தல்லியம்
- தல்லியம் (talliyam)chemical element
Thai แทลเลียม
- แทลเลียม (tɛɛl-lîiam)chemical element
Turkish talyum
- talyumchemical element
Ukrainian та́лій
- та́лій (tálij)chemical element
Vietnamese tali
- talichemical element
Welsh thaliwm
- thaliwmchemical element
Yiddish טאַליום
- טאַליום (talyum)chemical element
Rhymes & wordplay
Rhymes with thallium
All rhymes →Cite this entry
thallium. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/thallium
“thallium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/thallium. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “thallium,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/thallium.
Source: thallium on Wiktionary, CC BY-SA 4.0.