gigantism
noun/dʒaɪˈɡæntɪzəm/, /ˈdʒaɪɡæntɪzəm/
/dʒaɪˈɡæntɪzəm/, /ˈdʒaɪɡæntɪzəm/
(also giantism)
[uncountable] (medical)- a condition in which somebody grows to an unusually large size
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gigantism
Definition of gigantism noun from the Oxford Advanced Learner's Dictionary