acrogen

2 definitions found

acrogen - Collaborative International Dictionary of English v.0.48 :

  Acrogen \Ac"ro*gen\, n. [Gr. 'a`kros extreme, high + -gen.]
     (Bot.)
     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]

acrogen - WordNet (r) 2.1 (2005) :

  acrogen
      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