THALLIUM

thallium, Tl, atomic number

(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® 3.1

Etymology

Noun

thallium (countable and uncountable, plural thalliums)

A metallic chemical element (symbol Tl) with atomic number 81: a gray post-transition metal that discolors when exposed to air.

A single atom of this element.

Source: Wiktionary

Thal"li*um, n. Etym: [NL., fr. Gr. green line in its spectrum.] (Chem.)

Definition: 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’s Unabridged Dictionary 1913 Edition

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