One of the mysteries of the English language finally explained.
Of, relating to, or designating fossil reptiles of the genus Protorosaurus and their allies; specifically belonging to the order Protorosauria.
Late 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Protorosaurus (or Proterosaurus) Protorosaurus + -ian, after scientific Latin Protorosauria (or Proterosauria), order name.
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