Thallium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A soft, malleable, highly toxic metallic element, used in photocells, infrared detectors, low-melting glass, and formerly in rodent and ant poisons. Atomic number 81; atomic weight 204.38; melting point 303.5°C; boiling point 1,457°C; specific gravity 11.85; valence 1, 3. See Table at element.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. A metallic chemical element (symbol Tl) with atomic number 81.
  • the GNU version of the Collaborative International Dictionary of English
  • n. A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.
  • The Century Dictionary and Cyclopedia
  • n. Chemical symbol, Tl; atomic weight, 204.2. A rare metal which was discovered in the residuum left from the distillation of selenium by Crookes, in 1861, and was first supposed to contain tellurium, but afterward proved, by the aid of the spectroscope, to be new.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. 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
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    gallium   
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    Words that are found in similar contexts
    strontium    amyl    mercuric    nitronium    cesium