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The Collaborative International Dictionary of English v.0.48:

Thallus \Thal"lus\, n.; pl. Thalli. [NL., fr. Gr. ? young shoot or branch, frond.] (Bot.) 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. [1913 Webster]