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Thallium

//ˈθæliəm// noun

Noun

1
A metallic chemical element (symbol Tl) with atomic number 81: a gray post-transition metal that discolors when exposed to air. countable, uncountable
"Environmental authorities in Lüeyang County, Shaanxi province, discovered excessive levels of thallium in two of the Jialing River’s upstream tributaries on Jan. 20, according to a statement Monday. The concentration of thallium that day was 170% higher than the standard for Qingni River, one of the upstream tributaries bordering Gansu province."
2
a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores wordnet
3
A single atom of this element. countable, uncountable

Coined based on Ancient Greek θαλλός (thallós, “green branch”) (after the color of the radiation spectra), + -ium.

Unscramble this word: thallium