thallium

thallium
[ˈθalɪəm]
noun

[mass noun]the chemical element of atomic number 81, a soft silvery-white metal which occurs naturally in small amounts in iron pyrites, sphalerite, and other ores. Its compounds are very poisonous(Symbol: Tl)
（化学元素）铊(符号：Tl)
The metal itself has few uses; its compounds have some specialized uses, e.g. in infrared and optical equipment. Thallium compounds are very poisonous and have been used as insecticides and rat poison

thallic
adjective
thallous
adjective
语源

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

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