trisomy trisomic • trisomy 21 · · · Info · Definitions · Characters · · trisomy · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell. · · Noun Definition 1 Characters · · i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079