incisura
noun [ C ] medical specialized uk/ˌɪn.sɪˈʒʊə.rə/ us/ˌɪn.sɪˈʒʊr.ə/ incisurae /ˌɪn.sɪˈʒʊə.raɪ/ /ˌɪn.sɪˈʒʊr.aɪ/
（在器官或身体上留下的）圆形（或角状）切迹
a round or V-shaped hollow in an organ or body part
（主动脉血压图上的）切迹，降中峡
in a graph of the blood pressure in the aorta, a place where the curve goes slightly downwards and quickly up again just before the aortic valve closes