thal‧li‧um /ˈθæliəm/
noun [uncountable][
Date: 1800-1900;
Language: Modern Latin;
Origin: Greek thallos 'new green plant part'; because it has a bright green line in its spectrum]
a soft blue-white metal that is poisonous, used in
photoelectric cells and to kill rats, mice, and insects. It is a chemical
element: symbol Tl.
[TahlilGaran] Dictionary of Contemporary English ▲