Source : Webster's Revised Unabridged Dictionary (1913)

Imprecate \Im"pre*cate\, v. t. [imp. & p. p. {Imprecated}; p.
   pr. & vb. n. {Imprecating}.] [L. imprecatus, p. p. of
   imprecari to imprecate; pref. im- in, on + precari to pray.
   See {Pray}.]
   1. To call down by prayer, as something hurtful or
      calamitous.

            Imprecate the vengeance of Heaven on the guilty
            empire.                               --Mickle.

   2. To invoke evil upon; to curse; to swear at.

            In vain we blast the ministers of Fate, And the
            forlorn physicians imprecate.         --Rochester.