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1. The larger of two muscles that originate in the lower spine. This muscle flexes the hip. Also called psoas major.
2. The smaller of two muscles that originate in the lower spine. This muscle flexes the lower spine. Also called psoas minor.
[New Latin, from Greek psoa.]
(Anatomy) either of two muscles of the loins that aid in flexing and rotating the thigh
[C17: from New Latin, from Greek psoai (pl)]
n., pl. pso•ai (sō′ī), pso•ae (sō′ē).
either of a pair of deep loin muscles extending from the sides of the spine to the femur.
[1675–85; < New Latin < Greek psóās]
pso•at′ic (-ˈæt ɪk) adj.
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|Noun||1.||psoas - either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh|