| thallium | (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, Syn. atomic number 81, Tl |
| 铊 | [铊 / 鉈] thallium Tl, metal, atomic number 81 #48,592 [Add to Longdo] |