Prior mistook this term for a unit. It is not; it is a shape formed by plowing. See the OED.
W. H. Prior.
Notes on the weights and measures of Medieval England.
Bulletin du Cange. Archivvm Latinitatis Medii Aevi, vol. 1.
Paris: Librairie Ancienne Edouard Champion, 1924.
Page 150, citing
James F. Morgan.
England under the Norman Occupation.
London: Williams and Norgate, 1858. Page 28.
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