the , considered as essential to maintain :
to spill one’s lifeblood in war.
a life-giving, vital, or animating element:
Agriculture is the lifeblood of the country.
the blood, considered as vital to sustain life
the essential or animating force
also life-blood, 1580s, “blood necessary for life,” from life (n.) + blood (n.). Figurative and transferred use is from 1590s.
noun 1. a beltlike life preserver. noun 1. a ring filled with buoyant material or air, used to keep a person afloat when in danger of drowning
noun, Nautical. 1. an arrowlike projectile for carrying a line for use in maritime rescue operations.
noun, Aeronautics. 1. an aircraft or spacecraft configuration in which there are no wings, and lift is obtained by aerodynamic forces on its body. noun 1. a wingless aircraft or spacecraft that derives its aerodynamic lift from the shape of its body
noun, Nautical. 1. a sail that when filled tends to raise the hull of a ship or boat (opposed to ).