1. thallium

noun. ['ˈθæliːəm'] 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.


  • atomic number 81
  • zinc blende
  • sphalerite
  • blende
  • Tl
  • metal


  • θαλλός (Ancient Greek (to 1453))

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Rhymes with Thallium

  • gallium

Sentences with thallium

1. Noun, singular or mass
It's worth noting that toxins such as mercury, lead and thallium can damage the kidneys; tuna and other fish can contain all three heavy metals.