WordWeb Online

1. [vulgar] Feeling great sexual desire
   "feeling horny";
   - aroused, steamy, turned on
    
2. Having horns or hornlike projections
   "horny coral"; "horny (or horned) frog"
    
3. Made of horn (or of a substance resembling horn)
   "A venomous African snake has a horny projection above his head";
   - corneous, hornlike

Derived forms: horniest, hornier

See also: hard, horned, sexy [informal]

Encyclopedia: Horny