Definition of "latissimus" [latissimus]

• The broadest muscle which lies upon the back; one of the muscles of the anterior extremity, arising from the spines of numerous vertebræ, and some other parts, and inserted into the upper part of the humerus: commonly called more fully latissimus dorsi. See cut under muscle. (noun)

The Century Dictionary (Public Domain)

• "From its wide expanse on the back it is known as the latissimus dorsi"
• "Works upper back muscles trapezius, latissimus dorsi"
• "He pressed his fingertips into the latissimus dorsi."