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Search Result for "acrogen": 
Wordnet 3.0

NOUN (1)

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


The 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]
WordNet (r) 3.0 (2006):

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