noun, plural psoai [soh-ahy] , psoae [soh-ee] . Anatomy.
either of two muscles, one on each side of the loin, extending internally from the sides of the spinal column to the upper end of the femur, which assist in flexing and rotating the thigh and flexing the trunk on the pelvis.

1675–85; < Neo-Latin < Greek psóās, accusative plural (taken as nominative singular) of psóa a muscle of the loins

psoatic [soh-at-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psoas (ˈsəʊəs)
either of two muscles of the loins that aid in flexing and rotating the thigh
[C17: from New Latin, from Greek psoai (pl)]

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