incisura

noun

in·​ci·​su·​ra ˌin-ˌsī-ˈzhu̇r-ə  ˌin(t)-sə- 

plural incisurae -ē 

1

: a notch, cleft, or fissure of a body part or organ

2

: a downward notch in the curve recording aortic blood pressure that occurs between systole and diastole and is caused by backflow of blood for a short time before the aortic valve closes

incisural

-əl 

adjective