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from protho-, proto- + daw (n.) a silly fellow, a simpleton, a fool
From: Hall's Chronicle
Containing The History of England,
During the Reign of Henry the Fourth, and the Succeeding Monarchs,
To the end of the Reign of Henry the Eighth.
Carefully Collated with the Editions of 1548 and 1550
The VIII Yere of Kyng Henry the V.