Search Result for "lifeblood": 
Wordnet 3.0

NOUN (2)

1. the blood considered as the seat of vitality;

2. an essential or life-giving force;
- Example: "water is the lifeblood of India"



The Collaborative International Dictionary of English v.0.48:

Lifeblood \Life"blood`\ (l[imac]f"bl[u^]d`), n.
   1. The blood necessary to life; vital blood. --Dryden.
      [1913 Webster]

   2. Fig.: That which gives strength and energy.
      [1913 Webster]

            Money [is] the lifeblood of the nation. --Swift.
      [1913 Webster]


WordNet (r) 3.0 (2006):

lifeblood
    n 1: the blood considered as the seat of vitality
    2: an essential or life-giving force; "water is the lifeblood of
       India"