Gigantism, also known as giantism (from Greek gigas, gigantas ""),'s a condition characterized by excessive growth and height significantly above average. Types As a medical term, gigantism can refer to: "Pituitary gigantism",these are people who their hormones over produce which's due to prepubertal growth hormone excess. This's sometimes equated with acromegaly, but more precisely, an excess of growth hormone leads to "pituitary gigantism" (vertical growth) if the epiphyseal plates haven't y… (More on Giantism)