thallus, i, m., = θαλλός,
a green stalk , green bough : cepae, Col. 11, 3, 58; Pall. Febr. 24, 4: Amyclaeus, perh. a myrtlebough , Verg. Cir. 376; Vulg. 2 Macc. 14, 4.
·noun A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a fl...
Webster's Dictionary of the English Language