psoas Meaning, Definition & Usage

  1. noun either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh

WordNet

Pso"as noun
Etymology
Gr. a muscle of the loin: cf. f. psoas.
Definitions
  1. (Anat.) An internal muscle arising from the lumbar vertebræ 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.

Webster 1913