trisomy 21   (TTS Sound)

The trisomy_21 has 1 Senses.

• mongolism, down syndrome, mongolianism, trisomy 21, down's syndrome
• 蒙古症, ダウン症候群
• a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
• 21番目の染色体が1本余分にあることによって生じる先天性異常