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Noun pteridospermopsida has 1 sense
  1. Pteridospermopsida, class Pteridospermopsida - extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies
    --1 is a kind of class
    --1 is a member of
     Gymnospermae, class Gymnospermae, Gymnospermophyta, division Gymnospermophyta
     --1 has members:
     Cycadofilicales, order Cycadofilicales, Lyginopteridales, order Lyginopteridales
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