Ac″ro‐gen (�), n. [Gr. ἄκροσ extreme, high + -gen.] (Bot.) A plant of the highest class of cryptogams, including the ferns, etc. See Cryptogamia.
The Age of Acrogens(Geol.), the age of coal plants, or the carboniferous era.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.