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 | ||