One of the mysteries of the English language finally explained.
Of, relating to, or belonging to the group of extinct seed-bearing ferns (pteridosperms) including the genus Medullosa, known from Carboniferous and Permian fossils, whose stems have large, widely-spaced petioles and branched vascular cylinders.
A seed-bearing fern of the extinct genus Medullosa or the group to which it belongs.
Early 20th century; earliest use found in Philosophical Transactions of the Royal Society of London. From Medullosa + -an.
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