aperturaladj.

/əˈpəːtjʊərəl/Etymology: < Latin apertūra + -al suffix1.
the world > space > relative position > condition of being open or not closed > an opening or aperture > [adjective]
1851 S. P. Woodward i. 118 Mangelia... Apertural slit at the suture.
This entry has not yet been fully updated (first published 1885; most recently modified version published online March 2018).