from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or containing thallium, especially with valence 3.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to or containing the element thallium, especially with valence 3.
  • adj. Pertaining to a thallus.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a higher valence as contrasted with the thallous compounds.

from The Century Dictionary and Cyclopedia

  • In chem., of, pertaining to, or containing thallium: as, thallic acid.


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