What is "powrefull"

Usage examples of "powrefull".

For from his fearefull eyes two fierie beames,More sharpe then points of needles did proceede,Shooting forth farre away two flaming streames,Full of sad powre, that poysonous bale did breedeTo all, that on him lookt without good heed,And secretly his enemies did slay:Like as the Basiliske of serpents seede,From powrefull eyes close venim doth conuayInto the lookers hart, and killeth farre away.