| acrogen | <botany> A plant of the highest class of cryptograms, including the ferns, etc. See Cryptogamia. <geology> The Age of Acrogens, the age of coal plants, or the carboniferous era. Origin: Gr. Extreme, high + -gen. Source: Websters Dictionary (01 Mar 1998) |
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| acrogenous | <botany> Increasing by growth from the extremity; as, an acrogenous plant. Source: Websters Dictionary (01 Mar 1998) |