Acrogen
Pronunciation : Ac"ro*gen
Part of Speech : n.
Etymology : [Gr. -gen.] (Bot.)
Definition : Defn: A plant of the highest class of cryptograms, including the ferns, etc. See Cryptogamia. The Age of Acrogens (Geol.), the age of coal plants, or the carboniferous era.
Source : Webster's Unabridged Dictionary, 1913