thallium

/หˆฮธรฆliษ™m/

IPA: /TH AE1 L IY0 AH0 M/

noun
  1. 1

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

  2. 2

    A single atom of this element.

Source: https://en.wiktionary.org/wiki/thallium