noun

• (chiefly literary, poetic)
• (chiefly literary, poetic)
  "Quick, and more quick he ſpins in giddy Gires, / Then falls, and in much Foam his Soul expires."
• (anatomy, zootomy, archaic) Synonym of gyrus (“a fold or ridge on the cerebral cortex of the brain”).
• (oceanography) An ocean current caused by wind which moves in a circular manner, especially one that is large-scale and observed in a major ocean.
  "Most ships that tried to cross the Pacific in the past would get stuck in the gyres and never make it out."

verb

• (intransitive) To spin around; to gyrate, to whirl.
  "The host of heauenly beautyes moue, / Depainted in their proper stories, / As well the fixd as wandring glories, / Which from their proper orbes not goe, / Whether they gyre swift or slowe: […]"
• (transitive, rare) To make (something) spin or whirl around; to spin, to whirl.