/ Dictionary / Index L lifeblood: Meaning and Definition of Find definitions for: life•blood Pronunciation: (līf'blud"), [key] — n. the blood, considered as essential to maintain life: to spill one's lifeblood in war. a life-giving, vital, or animating element: Agriculture is the lifeblood of the country. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lifeblood (Thesaurus) life belt lifeboat Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language