Source : Webster's Revised Unabridged Dictionary (1913)

Excruciation \Ex*cru`ci*a"tion\n. [L. excruciatio.]
   The act of inflicting agonizing pain, or the state of being
   thus afflicted; that which excruciates; torture. --Feltham.

Source : WordNet®

excruciation
     n 1: a state of acute pain [syn: {agony}, {suffering}]
     2: the infliction of extremely painful punishment or suffering
        [syn: {crucifixion}]