1. [n]  any creature of exceptional size
2. [n]  an unusually large enterprise; "Walton built a retail giant"
3. [n]  a very bright star of large diameter and low density (relative to the Sun)
4. [n]  an imaginary figure of superhuman size and strength; appears in folklore and fair tales
5. [n]  a person of exceptional importance and reputation
6. [n]  someone or something that is abnormally large and powerful
7. [n]  a very large person; impressive in size or qualities
8. [adj]  of great mass; huge and bulky; "a jumbo jet"; "jumbo shrimp"

Giant
Three generations of men in a Texas family are chronicled in this book, which inspired the classic 1956 film starring Rock Hudson and James Dean. Reprint.

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1. \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}.]
   1. A man of extraordinari bulk and stature.
            Giants of mighty bone and bold emprise. --Milton.
   2. A person of extraordinary strength or powers, bodily or
      intellectual.
   3. Any animal, plant, or thing, of extraordinary size or
      power.
   {Giant's Causeway}, a vast collection of basaltic pillars, in
      the county of Antrim on the northern coast of Ireland.
   

2. \Gi"ant\, a.
   Like a giant; extraordinary in size, strength, or power; as,
   giant brothers; a giant son.
   {Giant cell}. (Anat.) See {Myeloplax}.
   {Giant clam} (Zo["o]l.), a bivalve shell of the genus
      {Tridacna}, esp. {T. gigas}, which sometimes weighs 500
      pounds. The shells are sometimes used in churches to
      contain holy water.
   {Giant heron} (Zo["o]l.), a very large African heron
      ({Ardeomega goliath}). It is the largest heron known.
   {Giant kettle}, a pothole of very large dimensions, as found
      in Norway in connection with glaciers. See {Pothole}.
   {Giant powder}. See {Nitroglycerin}.
   {Giant puffball} (Bot.), a fungus ({Lycoperdon giganteum}),
      edible when young, and when dried used for stanching
      wounds.
   {Giant salamander} (Zo["o]l.), a very large aquatic
      salamander ({Megalobatrachus maximus}), found in Japan. It
      is the largest of living Amphibia, becoming a yard long.
   {Giant squid} (Zo["o]l.), one of several species of very
      large squids, belonging to {Architeuthis} and allied
      genera. Some are over forty feet long.