'Pteridospermopsida' definitions:
Definition of '
Pteridospermopsida
'
From:
WordNet
noun
Extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies [syn: Pteridospermopsida,
class Pteridospermopsida
]
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Pteridospermopsida'
class pteridospermopsida
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