Thal"li*um (?), n. [NL., fr. Gr. young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum.] Chem.
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.
© Webster 1913.