WordReference Random House Unabridged Dictionary of American English © 2025
seed fern′, 
  1. Plant Biology, Paleontologyany of various plants of the order Lyginopteridales (or Cycadofilicales), known only as fossils, having fernlike leaves and reproducing by means of seeds. Also called pteridosperm. 
  • 1925–30

'seed fern' also found in these entries (note: many are not synonyms or translations):

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