girthline

noun3

1. •
   The circumference of an animal, measured under the belly and over the back; the part of the animal over which the girth fits.

   • Linear body measurements taken on 137 ewes showed that heart girth and abdominal girthline are significantly (P < 0.01) related to ewe weight, hence size. — 1988
2. •
   A real or imaginary line around the girth of something.

   • Breslau let out another hole in its belt recently, extending its municipal girthline to include a number of suburbs. — 1928
3. •
   A rope or cable that attaches around the girth of something.