WordReference Random House Unabridged Dictionary of American English © 2025
seed′ fern′,
- 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):