Webster’s Revised Unabridged Dictionary · 1913
Conacre
Con·a′cre (kŏn·ā′kẽr), v. t. To underlet a portion of, for a single crop; — said of a farm. [Ireland]
Con·a′cre, n. A system of letting a portion of a farm for a single crop. [Ireland] Also used adjectively; as, the conacre system or principle. Mozley & W.