Lexic.us

Definition of Thallium

1. 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.

Definition of 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.

Definition of Thallium

1. Noun. a metallic chemical element (''symbol'' Tl) with atomic number 81. ¹

¹ Source: wiktionary.com

Definition of Thallium

1. a metallic element [n -S] : THALLIC, THALLOUS [adj]

Medical Definition of Thallium

1. 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. Origin: NL, fr. Gr. Young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Thallium

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