资料来源 : Webster's Revised Unabridged Dictionary (1913)

Onomancy \On"o*man`cy\, n. [Gr. ? name + -mancy. Cf. {Nomancy}.]
   Divination by the letters of a name; nomancy. [R.] --Camden.

资料来源 : WordNet®

onomancy
     n : divination by the letters of a name