[jahy-gan-tiz-uh m, ji-, jahy-gan-tiz-uh m]
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noun Pathology.
  1. abnormally great development in size or stature of the whole body or of parts of the body, most often due to dysfunction of the pituitary gland.
Compare hypertrophy.

Origin of gigantism

1880–85; < Latin gigant- giant + -ism Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for gigantism


  1. Also called: giantism excessive growth of the entire body, caused by over-production of growth hormone by the pituitary gland during childhood or adolescenceCompare acromegaly
  2. the state or quality of being gigantic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for gigantism

1854, from Latin gigant- (see gigantic) + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper

gigantism in Medicine


  1. The quality or state of being gigantic; abnormally large size.
  2. Excessive growth of the body or any of its parts, especially as a result of oversecretion of the growth hormone by the pituitary gland.giantism
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.