Excessive or abnormal growth resulting in gigantic size; medically, a condition of abnormally large body growth, often caused by hormonal imbalances.
From 'gigant' plus the suffix '-ism' (condition, practice, or characteristic). In medicine, gigantism specifically refers to acromegaly or excessive growth hormone, distinct from the mythological concept of giant beings.
Gigantism in medicine is different from dwarfism—both come from pituitary gland problems, and historically people with either condition were exhibited in 'freak shows,' which is now recognized as exploitative and cruel!
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