Definition of gigantism noun from the Oxford Advanced American Dictionary

 

gigantism

 noun
noun
NAmE//dʒaɪˈɡæntɪzəm//
 
, NAmE//ˈdʒaɪɡænˌtɪzəm//
 
(also giantism)[uncountable](medical)
 
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a condition in which someone grows to an unusually large size
See the Oxford Advanced Learner's Dictionary entry: gigantism