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Noun: lifeblood  'lIf,blúd
  1. An essential or life-giving force
    "water is the lifeblood of India"
     
  2. The blood considered as the seat of vitality
    "The company's innovative products are its lifeblood"

Derived forms: lifebloods

Type of: blood, force

Encyclopedia: Lifeblood, the Thrombosis Charity