- Lit. 'plough-lands'. The long, narrow field of the long acre was necessitated by the plough-team of eight oxen. Such rigs were cumbersome and could not turn so neatly as the small team of two animals - or even people - pulling the light plough known as the aratra, a plough known to the Romans. The oxen needed more space to turn in, making the 'long acre' a practical solution. -
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.
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Aratura — The amount of land ploughable in one year by one plough. [< Lat. aratro = to plough] Cf. Carucate; Terrae carucae … Dictionary of Medieval Terms and Phrases