Vitals

1. n. pl. Fig.: The part essential to the life or health of anything; as, the vitals of a state.
2. n. pl. Organs that are necessary for life; more especially, the heart, lungs, and brain.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.