thal·li·um
noun/ˈθæliəm/
/ˈθæliəm/
[uncountable] (symbol Tl)
- a chemical element. Thallium is a soft silver-white metal whose compounds are very poisonous.
铊 Word Originmid 19th cent.: modern Latin, from Greek thallos ‘green shoot’, because of the green line in its spectrum.