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We found 34 dictionaries with English definitions that include the word thallium:
Click on the first link on a line below to go directly to a page where "thallium" is defined.

General (25 matching dictionaries)

1. thallium: Merriam-Webster.com [home, info]
2. thallium: Oxford Dictionaries [home, info]
3. thallium: American Heritage Dictionary of the English Language [home, info]
4. thallium: Collins English Dictionary [home, info]
5. thallium: Vocabulary.com [home, info]
6. Thallium, thallium: Wordnik [home, info]
7. thallium: Cambridge Advanced Learner's Dictionary [home, info]
8. thallium: Wiktionary [home, info]
9. thallium: Webster's New World College Dictionary, 4th Ed. [home, info]
10. thallium: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. thallium: Infoplease Dictionary [home, info]
12. thallium: Dictionary.com [home, info]
13. thallium: Online Etymology Dictionary [home, info]
14. thallium: UltraLingua English Dictionary [home, info]
15. Thallium: Wikipedia, the Free Encyclopedia [home, info]
16. Thallium: Online Plain Text English Dictionary [home, info]
17. thallium: Webster's Revised Unabridged, 1913 Edition [home, info]
18. thallium: Rhymezone [home, info]
19. Thallium: AllWords.com Multi-Lingual Dictionary [home, info]
20. Thallium: 1911 edition of the Encyclopedia Britannica [home, info]
21. thallium: Free Dictionary [home, info]
22. thallium: Mnemonic Dictionary [home, info]
23. thallium: WordNet 1.7 Vocabulary Helper [home, info]
24. thallium: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. thallium: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

26. thallium: Encyclopedia [home, info]

Medicine (5 matching dictionaries)

27. Thallium: MedTerms.com Medical Dictionary [home, info]
28. Thallium: Medical Dictionary [home, info]
29. thallium: online medical dictionary [home, info]
30. thallium: Medical dictionary [home, info]
31. Thallium: Drug Medical Dictionary [home, info]

Science (2 matching dictionaries)

32. Thallium: Extragalactic Astronomy [home, info]
33. Thallium, thallium: WebElements Periodic Table of the Elements [home, info]

Slang (1 matching dictionary)

34. Thallium: Urban Dictionary [home, info]

Quick definitions from WordNet (thallium) ▸ noun:  a soft gray 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 ▸ Word origin ▸ Words similar to thallium ▸ Usage examples for thallium ▸ Popular adjectives describing thallium ▸ Words that often appear near thallium ▸ Rhymes of thallium ▸ Invented words related to thallium