Sentence:  A chap named Eleazir Kendrick and I had chummed in together the summer afore and built a fish-weir and shanty at Setuckit Point, down Orham way. For a spell we done pretty well. Then there came a reg'lar <WSD>terror</WSD> of a sou'wester same as you don't get one summer in a thousand, and blowed the shanty flat and ripped about half of the weir poles out of the sand. 
Meaning of the word marked with <WSD> tags:  Something or someone that causes such fear.