noun (n)

• the forceful insertion of a substance under pressure(noun.act)

  source: wordnet30
• any solution that is injected (as into the skin)(noun.substance)

  Synonym:
  injectant
  

  source: wordnet30
• the act of putting a liquid into the body by means of a syringe(noun.act)

  Synonym:
  shot
  

  source: wordnet30
• The act of injecting or throwing in; -- applied particularly to the forcible throwing in of a liquid, or aëriform body, by means of a syringe, pump, etc.(noun)

  source: webster1913