ramline

from The Century Dictionary.

• noun In ship-building, a small rope or line used for setting the frames fair, assisting in forming the sheer of the ship, or for other similar purposes.
• noun In spar-making, a line used to make a straight middle line on a spar.

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

• noun A line used to get a straight middle line, as on a spar, or from stem to stern in building a vessel.

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

• noun A line used to get a straight middle line, as on a spar, or from stern to stern in building a vessel.