Down's syndrome:- وجود صبغيّ جسديّ رقم 21 زائد في النواة، فتصبح ثلاثية الصبغيّ 21، وهذا يؤدي إلى التخلف العقليّ في الإنسان. (المعجم الموحد لمصطلحات علم الوراثة)
Down's syndrome:- a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation (Princeton WordNet 3.1)
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