GNU Collaborative International Dictionary of English

Found one definition

      
Acrogen , n. [Gr. ἄκρος 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

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