The Collaborative International Dictionary of English v.0.48:

Giant \Gi"ant\, n. [OE. giant, geant, geaunt, OF. jaiant, geant,
   F. g['e]ant, L. gigas, fr. Gr. ?, ?, from the root of E.
   gender, genesis. See Gender, and cf. Gigantic.]
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   1. A man of extraordinari bulk and stature.
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            Giants of mighty bone and bold emprise. --Milton.
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   2. A person of extraordinary strength or powers, bodily or
      intellectual.
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   3. Any animal, plant, or thing, of extraordinary size or
      power.
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   Giant's Causeway, a vast collection of basaltic pillars, in
      the county of Antrim on the northern coast of Ireland.
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