Entry 1 sense Webster, 1913 Abdominothoracic · Ab·dom·i·no·tho·rac·ic · IPA /æbˌdɑm.ɪ.noʊ.θɔɹˈæs.ɪk/ 01 a. Relating to the abdomen and the thorax, or chest. 1. Relating to the abdomen and the thorax, or chest.