apertura

noun
ap·​er·​tu·​ra | \ ˌap-ə(r)-ˈchu̇(ə)r-ə How to pronounce apertura (audio) , -ˈt(y)u̇(ə)r- How to pronounce apertura (audio) \
plural aperturae\ -​ˌī, -​ˌē How to pronounce aperturae (audio) \

Medical Definition of apertura

: an anatomical opening or aperture