means A very tall multi-story building, the kind that dominates a city skyline.

from Long before it meant a building, 'skyscraper' was a word that got around: in the 18th and 19th centuries it named the tallest, topmost sail on a ship — the one that seemed to brush the sky. From there it drifted onto anything improbably high, including a tall horse, a tall hat, even a tall person, and a high-flying ball in early baseball. When iron and steel framing let buildings climb in the late 19th century, the old nautical nickname was waiting, and it stuck to the towers of cities like Chicago and New York.