A circular or spiral form; a vortex: "rain swirling the night into tunnels and gyres” ( Anthony Hyde).
A circular or spiral motion, especially a circular ocean current.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.