Lifeblood

//ˈlaɪfˌblʌd// noun

noun ·Moderate ·College level

Definitions

Noun
  1. 1
    Blood that is needed for continued life; blood regarded as the seat of life. uncountable, usually

    "[Y]ou desire his mana, yet you respect his tabu, for in you and him alike runs the common life-blood."

  2. 2
    an essential or life-giving force wordnet
  3. 3
    That which is required for continued existence or function. figuratively, uncountable, usually

    "Gasoline is the lifeblood of the modern city."

  4. 4
    the blood considered as the seat of vitality wordnet

Synonyms

All synonyms
animaanimating forceantibodyantigenarterial bloodatman

Example

More examples

"The ocean is the lifeblood of Earth, covering more than 70 percent of the planet's surface, driving weather, regulating temperature, and ultimately supporting all living organisms."

Etymology

From life + blood. Compare English heart-blood (“lifeblood”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.