iugerum

Etymology
From, from. The plural preserves the original consonant-stem forms (from an unattested singular ), while the singular was back-formed from the nominative-accusative plural as a 2nd declension noun.

Noun

 * 1)  A juger, a Roman unit of area, equivalent to 2 acti or 28,800 square feet (approximately ⅔ acre or ¼hectare).