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| amentia |
serious mental retardation, caused by genetic factors. (Cf. dementia.) |
| Down's syndrome |
a congenital condition caused by an abnormal number of chromosomes which results in mental retardation and produces distinctive physical characteristics such as a broad face, flattened head, and slanted eyes. |
| PKU |
a genetic disorder characterized by the inability to metabolize phenylaline, often causing mental retardation; phenylketonuria. |
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