Gigantism or giantism, (from Greek gigas, gigantas " giant") is a condition characterized by excessive growth and height significantly above average.
Gigantism refers to abnormally high linear growth due to excessive action of insulin-like growth factor-I (IGF-I) while
noun Pathology. 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.