巨きょ大だい症しょうきょだいしょうMeanings1noungigantismMedical term for excessive growth, often due to hormonal imbalance.巨きょ大だい症しょうは成せい長ちょうホルモンの過か剰じょう分ぶん泌ぴつによって起おこる。Gigantism is caused by excessive secretion of growth hormone.