Search Result for "psoas": 
Wordnet 3.0

NOUN (1)

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


The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

psoas n 1: either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh