From The Collaborative International Dictionary of English v.0.48:

Pteridophyta \Pter`i*doph"y*ta\, n. pl. [NL., from Gr. ?, ?, a
   fern + ? a plant.] (Bot.)
   A class of flowerless plants, embracing ferns, horsetails,
   club mosses, quillworts, and other like plants. See the Note
   under Cryptogamia. -- Pter"i*do*phyte`, n.
   [1913 Webster]

   Note: This is a modern term, devised to replace the older
         ones acrogens and vascular Cryptogamia.
         [1913 Webster]
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