Source : Webster's Revised Unabridged Dictionary (1913)

Hygeia \Hy*ge"ia\, n. [L. Hygea, Hygia, fr. Gr. ?, ?, health, ?,
   Hygeia, fr. ? sound, healthy.] (Classic Myth.)
   The goddess of health, daughter of Esculapius.

Source : WordNet®

Hygeia
     n : (Greek mythology) the goddess of health