noun
heteroploid
Technical term in genetics/cytology for a cell or organism with a chromosome number differing from the normal diploid number, but not an exact multiple of the haploid number.
異数体は染色体数の異常によって生じる。
Heteroploids arise from abnormalities in chromosome number.
Compound of 異 (i, 'different') + 数 (sū, 'number') + 体 (tai, 'body'), likely a calque from English 'heteroploid' or German 'Heteroploid'.