An organ of the body which performs a sufficiently important function that damage to the organ can cause death.

A single important number derived from public health data or personal measurements.

(biology) Any function of the body that is essential for maintaining life, especially breathing and circulation.

(biology) The maximum volume of air that can be discharged from the lungs following maximum inspiration.

(medicine) A particular component of a patient's vital signs

vital force (or the application of such a force)

A hypothetical force that is the causative agent for the development of life

plural of vital capacity

plural of vital function

plural of vital force