English noun: thallium | |||
| 1. | thallium (substance) 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 | ||
| Synonyms | atomic number 81, Tl | ||
| Broader (hypernym) | metal, metallic element | ||
| Substance meronym | blende, sphalerite, zinc blende | ||