n 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
John Henry in 오마ì´ë‰´ìŠ¤ I can tell you he's ill. He is quite seriously sick. There's no doubt that he's been poisoned by thallium, and it probably dates back to Nov. 1, when he first started to get ill,Henry said.
Oleg Gordievsky in Daily Mail Gordievsky, who was the KGB station chief at the Soviet embassy in London in the Eighties, believes his would-be assassin used a "variant or derivative of thallium".