thallium=الثاليوم

-->

thallium=الثاليوم

ONLINE ETYMOLOGY DICTIONARY:

thallium (n.)

rare metallic element, 1861, Modern Latin, from Gk. thallos "young shoot, green branch" (see thallus) + element name ending -ium. So called by its discoverer, Sir William Crookes (1832-1919), from the green line in its spectrum by which he detected it.

thallus (n.)

Latin, from Gk. thallos "green shoot, twig," related to thalia "abundance," thalos "scion, child," ultimately from PIE root *dhal- "to bloom" (cf. O.Ir. duilesc, a type of algae).

WIKIPEDIA

Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray poor metal is not found free in nature.