From The Collaborative International Dictionary of English v.0.48:

Vitals \Vi"tals\, n. pl.
   1. Organs that are necessary for life; more especially, the
      heart, lungs, and brain.
      [1913 Webster]

   2. Fig.: The part essential to the life or health of
      anything; as, the vitals of a state. "The vitals of the
      public body." --Glanvill.
      [1913 Webster]
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