thallium

1. 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. Source: opted

2. 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 Source: wordnet

3. 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

4. A rare metallic element of the aluminium group found in someminerals, as certain pyrites, and also in the lead-chamber deposit inthe manufacture of sulphuric acid. It is isolated as a heavy, soft,bluish white metal, easily oxidized in moist air, but preserved bykeeping under water. Symbol Tl. Atomic weight 203.7. Source: adambom

5. n:100 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 Source: ecdict

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