longissimus

plural longissimi

1. anatomyThe muscle lateral to the semispinalis; the longest subdivision of the sacrospinalis that extends forward into the transverse processes of the posterior cervical vertebrae.

   Bull carcasses have greater longissimus muscle area per unit weight, less trimmable fat, and, consequently, a higher yield of retailable meat than either steer or heifer carcasses.

   1967, University of Missouri - Columbia, Agricultural Experiment Station, Research Bulletin (issues 912-929, page 35)