Definition of psoas in English:


Line breaks: psoas
Pronunciation: /ˈsəʊas
(also psoas major)


  • Each of a pair of large muscles which run from the lumbar spine through the groin on either side and, with the iliacus, flex the hip. A second muscle, the psoas minor, has a similar action but is often absent.
    More example sentences
    • The internal iliac artery (ie, hypogastric) enters the pelvis and supplies the psoas major and quadratus lumborum muscles, the pelvic viscera, and parts of the bony pelvis.
    • The psoas and iliacus muscles are occasionally completely independent muscles.
    • Another group of muscles of the pelvic girdle act to flex the hip, and include the psoas, the iliacus, a combination of the two called the iliopsoas, the pectineus, and the sartorius muscles.


late 17th century: from Greek, accusative plural of psoa, interpreted as singular.

More definitions of psoas

Definition of psoas in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space