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.
- synonyms: thallium, atomic number 81
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| APA | WordNet. (2010). TL. Retrieved October 2, 2026, from http://smartdefine.org/tl/definitions/1316482 |
| Chicago | WordNet. 2010. "TL" http://smartdefine.org/tl/definitions/1316482 (accessed October 2, 2026). |
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| MLA | WordNet. "TL" 23 October 2010. Web. 2 October 2026. <http://smartdefine.org/tl/definitions/1316482> |