Thallium is a chemical element. It is a soft, toxicharmful or able to cause illness or death metal that can appear grey and dull when exposedleft open to contact with something, especially outside to air. It is known for being poisonous and for its use in some types of rodenta small mammal such as a mouse or rat that gnaws and insect poison.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.
Pronunciation
AI-generated pronunciation audio (OpenAI).
Accent: General American English
IPA: /THAL-ee-əm/
Easy pronunciation: THAL-ee-um (approximate spelling).
Stress: Stress the first syllable: THAL.
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.
Thallium Meaning
a soft, poisonous metallic chemical element
Part of speech: noun
Definition: 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
Example: Thallium is extremely toxic and must be handled with great care.
Synonyms for this meaning:
- atomic number 81 — Scientific identifier for the element thallium.
- tl — Chemical symbol for thallium.
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.
Thallium Synonyms
Similar Meaning
- atomic number 81
- tl
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.
Common Mistakes
- People sometimes confuse thallium with other metallic elements, but it specifically refers to the toxic chemical element with symbol Tl.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.
Frequently Asked Questions
What does thallium mean?
Thallium is a chemical element: a soft, toxic metal with the symbol Tl.
What are synonyms for thallium?
The supplied lexical data only gives scientific identifiers for thallium: atomic number 81 and Tl. These are not everyday synonyms, but they are the closest equivalents in technical use.
Is thallium a noun?
Yes. Thallium is a noun naming a chemical element.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-26. AI assessment; not a guarantee of accuracy.