Sentence:  He turned from the flying trees to look ahead and saw with an inward boy 's eye again the great fieldstone house which , built on one of the many <WSD>acres</WSD> of ancestral land bordering the west harbor , had been Izaak 's bride-gift to his cousin wife as the last century ended . 
Meaning of the word marked with <WSD> tags:  a unit of area (4840 square yards) used in English-speaking countries