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2 definitions found
 for Acrogen
From The Collaborative International Dictionary of English v.0.48 :

  Acrogen \Ac"ro*gen\, n. [Gr. 'a`kros extreme, high + -gen.]
     A plant of the highest class of cryptogams, including the
     ferns, etc. See Cryptogamia.
     [1913 Webster]
     The Age of Acrogens (Geol.), the age of coal plants, or the
        carboniferous era.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: any flowerless plant such as a fern (pteridophyte) or moss
           (bryophyte) in which growth occurs only at the tip of the
           main stem

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