Lifeblood Definition

līfblŭd
noun
The blood necessary to life.
Webster's New World
A vital element or animating influence.
Webster's New World
(figuratively) That which is required for continued existence or function.
Gasoline is the lifeblood of the modern city.
Wiktionary

Other Word Forms of Lifeblood

Noun

Singular:
lifeblood
Plural:
lifebloods

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lifeblood