perforation

Plural: perforations

Noun

• a line of small holes for tearing at a particular place
• a hole made in something
  • "a perforation of the eardrum"
• the act of punching a hole (especially a row of holes as for ease of separation)
• The act of perforating or the state of being perforated.
• Any opening in a solid object.
• An abnormal opening in an organ, such as a rupture.
• A series of holes punched through something in order to assist in separating parts.
• That portion of a surface that remains after an open disk is removed from it.