Source : Webster's Revised Unabridged Dictionary (1913)

Eudemon \Eu*de"mon\, Eudaemon \Eu*d[ae]"mon\, n. [Gr. ? well,
   good + ? one's demon.]
   A good angel. --Southey.

Source : WordNet®

eudaemon
     n : a benevolent spirit [syn: {eudemon}, {good spirit}] [ant: {cacodemon}]