Sentence:  After these things above said, the Priest exorcised the salt, saying thus: I conjure thee, creature of salt; that is to say, I conjure in thee the <WSD>puissance</WSD> of the Devil in Hell, in the name of God Father omnipotent, and in the charity of our Lord Jesu Christ, and in the virtue of the Holy Ghost ... 
Meaning of the word marked with <WSD> tags:  Power, might or potency.