Definitions of suction:

  • noun:   a force over an area produced by a pressure difference
  • noun:   the act of sucking
  • verb:   empty or clean (a body cavity) by the force of suction
    Example: "Suction the uterus in an abortion"
  • verb:   remove or draw away by the force of suction
    Example: "The doctors had to suction the water from the patient's lungs"