medullosalean

/M EH1 D UW1 L OW1 S AH0 L IY1 AH0 N/
noun
  1. 1

    (botany) Any of the order Medullosales of pteridospermous seed plants characterised by large radiospermic ovules with a vascularised nucellus, complex pollen-organs, stems and rachises with a dissected stele, and frond-like leaves.

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