perforation

noun5

1. •
   Any opening in a solid object.
2. •
   An abnormal opening in an organ, such as a rupture.
3. •
   A series of holes punched through something in order to assist in separating parts.
4. •
   The act of perforating or the state of being perforated.
5. •
   That portion of a surface that remains after an open disk is removed from it.