linea semilunaris

noun

linea semi·​lu·​nar·​is -ˌsem-i-lü-ˈner-əs, -ˈnar- 

plural lineae semilunares -ˈner-ˌēz, -ˈnar- 

: a curved line on the ventral abdominal wall parallel to the midline and halfway between it and the side of the body that marks the lateral border of the rectus abdominis muscle

called also semilunar line