Noun:

1. chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell

Trina特里纳TRIabbr.技术报告说明书(三极管)(=Technical Report Instruction )tricuspid hypoplasia三尖瓣发育不全tritium labilization氚活化tri-stimulus value三刺激数值trisection compasses三等分分角规triketocholanic acid[医] 三酮胆烷酸triquetral cartilage三角软骨； 杓状软骨Trichotheca apicalisn.黑端齿股肖叶甲trisonic wind tunnel三速风洞trithiocarbonic acid三硫代碳酸,全硫碳酸Triticum dicoccoides拟二粒小麦

1. An aneuploid state in which a third homologous chromosome is present in addition to the normal autosomal pair is called trisomy.
   除了正常染色体对以外，还存在有第二种同源染色体的非整倍体状态，被称为三体性。