2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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] From WordNet (r) 2.0 [wn]: thallus n : a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes [also: {thalli} (pl)]
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