[ soh-uh s ]
/ ˈsoʊ əs /

noun, plural pso·ai [soh-ahy] /ˈsoʊ aɪ/, pso·ae [soh-ee] /ˈsoʊ i/. 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.

Origin of psoas

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

Related forms

pso·at·ic [soh-at-ik] /soʊˈæt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for psoas

British Dictionary definitions for psoas


/ (ˈsəʊəs) /


either of two muscles of the loins that aid in flexing and rotating the thigh

Word Origin for psoas

C17: from New Latin, from Greek psoai (pl)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012