selion

from The Century Dictionary.

• noun A ridge of land rising between two furrows: sometimes applied to the half-acre strips in the open-field system, which were separated by such ridges.

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

• noun Obs. or Prov. Eng. A short piece of land in arable ridges and furrows, of uncertain quantity; also, a ridge of land lying between two furrows.

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

• noun dated A mediaeval open strip of land or small field used for growing crops