E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
strictly speaking, is a sail above the fore-royal, the main-royal, or the mizzen-royal, more frequently called sky-scrapers. In general parlance any top-sail is so called.
Dashed by the strange winds sport, we were sunk deep in the green seas trough; and before we could utter an ejaculatory prayer, were upheaved upon the crown of some fantastic surge, peering our sky-rakers into the azure vault of heaven.C. Thomson: Autobiography, p. 120.