Definition of thallium
English to English noun - 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
source: WordNet 3.0 - 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.
source: Webster 1913
Visual Synonyms 
Nearby Word
thallium, talinum, thulium, talim, thalline, tallin, tallinn, thalian, tellima, thallene, tallyman, talma, talino, talion, talian, talien, talwin, tellina, tollman, tillman
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