• synonyms


[thal-uh s]
adjective Chemistry.
  1. containing univalent thallium.
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Also thal·li·ous [thal-ee-uh s] /ˈθæl i əs/.

Origin of thallous

First recorded in 1885–90; thall(ium) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thallous

Historical Examples of thallous

  • The precipitate is thallous iodide TlI, and contains 61.6 per cent.

    A Textbook of Assaying: For the Use of Those Connected with Mines.

    Cornelius Beringer and John Jacob Beringer

  • On allowing the liquid to stand for some time a bright yellow precipitate of thallous iodide separates out.

British Dictionary definitions for thallous


  1. of or containing thallium, esp in the monovalent state
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012