Prior mistook this term for a unit. It is not; it is a shape formed by plowing. See the Oxford English Dictionary.
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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