pyramidalis

noun
py·​ram·​i·​da·​lis | \ pə-ˌram-ə-ˈdā-ləs How to pronounce pyramidalis (audio) \
plural pyramidales\ -​(ˌ)lēz How to pronounce pyramidales (audio) \ or pyramidalises

Medical Definition of pyramidalis

: a small triangular muscle of the lower front part of the abdomen that is situated in front of and in the same sheath with the rectus and functions to tense the linea alba