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The Collaborative International Dictionary of English v.0.48 (gcide)

Viable \Vi"a*ble\, a. [F., from vie life, L. vita. See {Vital}.]
(Law)
Capable of living; born alive and with such form and
development of organs as to be capable of living; -- said of
a newborn, or a prematurely born, infant.
[1913 Webster]

VIABLE, Vitae habilis, capable of living. This is said
of a child who is born alive in such an advanced state
of formation as to be capable of living. Unless be is
born viable he acquires no rights and cannot transmit
them to his heirs, and is considered as if he had never
been born. --Bouvier (Law
Dictionary,
1856).
[1913 Webster]