Thallus
Pronunciation : Thal"lus
Part of Speech : n.;
Etymology : [NL., fr. Gr. (Bot.)
Definition : Defn: A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens.
pl. Thalli.
Source : Webster's Unabridged Dictionary, 1913