ˈ ̷ ̷| ̷ ̷ noun
1. : blood regarded as the seat of vitality
a gaping wound issuing lifeblood — Shakespeare
2. : something that gives or is held to give life and energy : a vital or life-giving force
water is the lifeblood of India — Chester Bowles
fuel oil has come to be the lifeblood of their civilization — K.R.Greenfield