Definition of thallium in English:

thallium

noun

  • The chemical element of atomic number 81, a soft silvery-white metal that occurs naturally in small amounts in pyrite and other ores. Its compounds are very poisonous.

    • ‘However, water-soluble rubidium, cesium, thallium, and silver minerals are virtually nonexistent and should pose no complication.’
    • ‘My advice is to undergo another test called stress thallium, which will show the amount of involvement of the heart muscle with ischemia.’
    • ‘When too much thallium circulates in the blood, it invades all the organs of the body, impairing their operation, destroying hair follicles, muscles, and nerves.’
    • ‘Over-exposure to thallium may cause nerve damage, emotional changes, cramps, convulsions and eventually coma which can lead to death caused by respiratory paralysis.’
    • ‘The scintillation detector, in this case a crystal of sodium iodide doped with thallium, emits a number of photons in direct proportion to the amount of energy deposited in the crystal by the dark matter particle.’

Origin

Mid 19th century: modern Latin, from Greek thallos green shoot because of the green line in its spectrum.

Pronunciation:

thallium

/ˈTHalēəm/