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thallium

Syllabification: (thal·li·um)
Pronunciation: /ˈTHalēəm/

Definition of thallium

noun

  • the chemical element of atomic number 81, a soft silvery-white metal that occurs naturally in small amounts in pyrite and other ores. Its compounds are very poisonous. (Symbol: Tl)

Origin:

mid 19th century: modern Latin, from Greek thallos 'green shoot', because of the green line in its spectrum

thallium in other Oxford dictionaries

Definition of thallium in the British & World English dictionary

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