Etymology
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psoas (n.)

muscle in the loins or pelvis, 1680s, from Greek psoa (plural psoai) "muscles of the loins." Related: Psoitis; psoitatic.

Gk. [psoas], the gen. of the feminine noun [psoa], was mistaken by the French anatomist Jean Riolan (1577-1657) for the nom. of a (nonexistent) masculine noun. It was he who introduced this erroneous form into anatomy. [Klein]

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Definitions of psoas

psoas (n.)
either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh;
From wordnet.princeton.edu