a ring or circle.
a circular course or motion.
Oceanography. a ringlike system of ocean currents rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.

1560–70; < Latin gȳrus < Greek gŷros ring, circle

subgyre, noun
supergyre, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gyre (dʒaɪə)
1.  a circular or spiral movement or path
2.  a ring, circle, or spiral
3.  (intr) to whirl
[C16: from Latin gӯrus circle, from Greek guros]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1566, "a circular motion;" as a verb, "to turn round," c.1420; from L. gyrus "circle," from Gk. gyros "circle, ring," related to gyros "rounded," from PIE base *geu- "to bend, curve."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
gyre   (jīr)  Pronunciation Key 
A spiral oceanic surface current driven primarily by the global wind system and constrained by the continents surrounding the three ocean basins (Atlantic, Pacific, and Indian). Each ocean basin has a large gyre in the subtropical region, centered around 30° north and south latitude. Smaller gyres occur at 50° north latitude in the North Atlantic and Pacific Oceans. The direction of a gyre's rotation is determined by the prevailing winds in the region, with the large subtropical gyres rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Circulating ocean currents create these gyres in several places around the world, and ocean-borne plastic gets trapped.
The region appears to be rife with eddies and gyres that are quite transient.
The northern and southern gyres of the oceans are separated by eastward flowing counter currents.
The low level gyres are generally weaker than those at upper levels.
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