Late 19th century; earliest use found in The Century Dictionary. From scientific Latin psoaticus from psoat-, taken as stem of post-classical Latin psoas + classical Latin -icus.
Definition of psoatic in US English:
psoatic
adjectivesəʊˈatɪk
Anatomy Zoology rare
Relating to or designating a psoas muscle.
Origin
Late 19th century; earliest use found in The Century Dictionary. From scientific Latin psoaticus from psoat-, taken as stem of post-classical Latin psoas + classical Latin -icus.