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2 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 mental retardation 名詞
 智力遲鈍,精神發育遲緩,智力遲延發育

From: WordNet (r) 2.0

 mental retardation
      n : lack of normal development of intellectual capacities [syn:
          retardation, backwardness, slowness, subnormality]