The Collaborative International Dictionary of English v.0.48:

Carucate \Car"u*cate\, n. [LL. carucata, carrucata. See
   Carucage.]
   A plowland; as much land as one team can plow in a year and a
   day; -- by some said to be about 100 acres. --Burrill.
   [1913 Webster] Caruncle