ThallogenThal"lo*gen\, n. [Gr. ? young shoot or branch, frond + -gen.] (Bot.) One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, alg[ae], and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf.
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
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