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