incisura

noun
in·​ci·​su·​ra | \ˌin-ˌsī-ˈzhu̇r-ə, ˌin(t)-sə- \
plural incisurae\-​ē \

Medical Definition of incisura 

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

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