longissimus

Noun

 * 1)  The muscle lateral to the semispinalis; the longest subdivision of the sacrospinalis that extends forward into the transverse processes of the posterior cervical vertebrae.
 * 2) * 1967, University of Missouri - Columbia, Agricultural Experiment Station, Research Bulletin (issues 912-929, page 35)
 * 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.