Definition of "Atlantick"

We croſs the Bay of Biſcay to the Main Atlantick.

1698, John Fryer, “The Contents”, in A New Account of East-India and Persia, in Eight Letters. Being Nine Years Travels, Begun 1672. And Finished 1681. […], London: […] R[obert] R[oberts] for Ri[chard] Chiswell, section “Letter I. Chap. I. Treats of Embarking, and Passage till past St. Iago.”, page i, column 1

That between the Tropicks in the Atlantick and the Ethiopick, as also throughout the whole South-Sea, ...

1730, The Religious Philosopher: or the Right Use of Contemplating the Works of the Creator, volume 2, John Chamberlayne, London, Globe, page 443

We find, too, that in the Atlantick it is high-water on the coast of Surinam about five o'clock on the days of the new and full of the moon, ...

1843, The Family Magazine, or, General Abstract of Useful Knowledge, volume 3, page 190