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1. (n.) thallium
a soft, malleable, rare, bluish white metallic element: used in the manufacture of alloys and, in the form of its salts, in rodenticides.
Etymology: (1861; < Gk thall(ós) green stalk+ -ium2; after the green line in its spectrum)
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| Definition of 'thallium' |
Princeton's WordNet |
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1. (noun) thallium, Tl, atomic number 81
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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| Definition of 'thallium' |
Webster Dictionary |
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1. (noun) thallium
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
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| Definitions of 'thallium' |
The Nuttall Encyclopedia |
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1. thallium
a rare metallic element similar to lead, but heavier, discovered in 1861 by the green in the spectrum in the flame as it was being volatilised.
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| Definition of 'thallium' |
U.S. National Library of Medicine |
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1. thallium
A heavy, soft, bluish white metal, atomic number 81, atomic weight 204.37, symbol Tl. (From Dorland, 28th ed)
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Definitions of thallium 
