thallium
Concise Oxford English Dictionary © 2008 Oxford University Press:
thallium /ˈθalɪəm/
▶noun the chemical element of atomic number 81, a soft silvery-white metal whose compounds are very poisonous. (Symbol: Tl)
– origin C19: mod. L., from Gk thallos ‘green shoot’, because of a green line in its spectrum.
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