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Webster 1913 Edition
Acrogen
Ac′ro-gen
,Noun.
[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.