psoas
UK[ˈsəʊ.æs]US[ˈsoʊ.æs]
n
either of a pair of muscles in the lower back and pelvis that flex the hip joint.
Etymology
the term 'psoas' is a direct borrowing from the greek word 'psoa', meaning 'muscles of the loins'. it entered english via new latin in the 17th century, where it was used in anatomical terminology. the greek term itself is of uncertain deeper origin, though it may be related to a verb meaning 'to breathe' due to the muscle's location near the diaphragm. its journey into modern medical english exemplifies the direct adoption of classical terms to provide precise, unambiguous labels for specific anatomical structures.
Analysis
the word is a simplex loanword from greek. it does not contain separable morphemes in its modern english form.
Examples
the physical therapist focused on stretching the patient's tight psoas muscle.
pain originating from the iliopsoas, which includes the psoas major, can mimic hip joint problems.
a core strengthening regimen often targets the psoas to improve stability.