noun (n)

• a depression scratched or carved into a surface(noun.shape)

  Synonym:
  dent, prick, scratch, slit
  

  source: wordnet30
• the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)(noun.act)

  Synonym:
  section, surgical incision
  

  source: wordnet30
• The act of incising, or cutting into a substance.(noun)

  source: webster1913