Dictionary
life•blood
Pronunciation: (līf'blud"), [key]—
n.
1. the blood, considered as essential to maintain life:
to spill one's lifeblood in war.
2. 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.