down syndrome down runner • down the stairs · · · Info · Definitions · Synonyms · Characters · · down syndrome · · Text Common · · Latin · · Scripts 13 · · Length 3 · · Syllables Definitions · · · (noun) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation. Synonyms: mongolism, mongolianism, Down's syndrome, Down syndrome, trisomy 21. · · Noun Definition 1 Synonyms · · · mongolism · · Synonym 1 mongolianism · · Synonym 2 down's syndrome · · Synonym 3 trisomy 21 · · Synonym 4 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 w latin small letter w U+0077 y latin small letter y U+0079