turnwrest

from The Century Dictionary.

• Noting a plow having a reversible mold-board, whereby a furrow may be turned either to the right or to the left, according to the position of the mold-board.

from the GNU version of the Collaborative International Dictionary of English.

• noun engraving, engraving Designating a cumbersome style of plow used in England, esp. in Kent.
• noun engraving Designating a kind of hillside plow.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun UK A cumbersome kind of plough formerly used in England, especially in Kent.