from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective medicine, anatomy, zoology Of, pertaining to, or having the nature of a
muscle, the parallel fibresof which attach to a tendonat an acuteangle (as a feather that is barbed on one side).
from Wiktionary, Creative Commons Attribution/Share-Alike License
Thirdly, in some muscles (e. g., the Peronei) the fibers are oblique and converge, like the plumes of a quill pen, to one side of a tendon which runs the entire length of the muscle; such muscles are termed unipennate.