vitals

The vital body organs.

The parts essential to continued functioning, as of a system.

Vital signs.

The viscera necessary for vital processes; those interior parts or organs which are essential to life, as the brain, heart, lungs, and stomach: a vague general term.

The part of any complex whole that is essential to its life or existence, or to a sound state: as, corruption of manners preys upon the vitals of a state.

Organs that are necessary for life; more especially, the heart, lungs, and brain.

Fig.: The part essential to the life or health of anything.

Those organs of the body that are essential for life.

Those parts of a system without which it cannot function.

vital signs