chiasma
/kaɪˈæzmə/noun
(pl. chiasmata /-tə/ )
- Biology a point at which paired chromosomes remain in contact during the first metaphase of meiosis, and at which crossing over and exchange of genetic material occur between the strands【生】（染色体）交叉。参见OPTIC CHIASMA.
词源
mid 19th cent.: modern Latin， from Greek chiasma 'crosspiece， cross-shaped mark'， from khiazein 'mark with the letter chi'.