thallium

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Syn:
Tl, atomic number 81
• Hypernyms:
metallic element, metal
• Substance Holonyms:
zinc blende, blende, sphalerite

• Từ đồng nghĩa / Synonyms:
  Tl, atomic number 81