Definitions for thallium

Overview of noun thallium

The noun thallium has 1 senses? (no senses from tagged texts)

1. thallium, Tl, atomic number 81

(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)