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Meaning of thallium

thal•li•um

Pronunciation: (thal'ē-um), [key]
— n. Chem.
  1. a soft, malleable, rare, bluish-white metallic element: used in the manufacture of alloys and, in the form of its salts, in rodenticides. Symbol: Tl; at. wt.: 204.37; at. no.: 81; sp. gr.: 11.85 at 20°C.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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