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psoas

noun
pso·​as | \ ˈsō-əs How to pronounce psoas (audio) \
plural psoai\ ˈsō-​ˌī How to pronounce psoai (audio) \ or psoae\ -​ˌē How to pronounce psoae (audio) \

Medical Definition of psoas

: either of two internal muscles of the loin:
a : psoas major
b : psoas minor

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