'Psoas' definitions:
Definition of 'psoas'
(from WordNet)
noun
Either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh
Definition of 'Psoas'
From: GCIDE
- Psoas \Pso"as\, n. [Gr. ? a muscle of the loin: cf. f. psoas.] (Anat.) An internal muscle arising from the lumbar vertebr[ae] and inserted into the femur. In man there are usually two on each side, and the larger one, or great psoas, forms a part of the iliopsoas. [1913 Webster]