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tl
Nountl has 1 sense
thallium, Tl, atomic number 81 - a soft gray 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 --1is a kind ofmetallic element, metal --1is a substance of zinc blende, blende, sphalerite