\Thal"line\, a. (Bot.)
Consisting of a thallus.

\Thal"line\, n. [Gr. ? a young shoot or branch.]
(Chem.)
An artificial alkaloid of the quinoline series, obtained as a
white crystalline substance, {C10H13NO}, whose salts are
valuable as antipyretics; -- so called from the green color
produced in its solution by certain oxidizing agents.