| 单词 | chiasma |
| 释义 | chiasma —chiasmal, chiasmic, chiasmatic /kuy'az mat"ik/, adj. /kuy az"meuh/, n. , pl. chiasmas, chiasmata /-meuh teuh/. 1. Anat. a crossing or decussation, as that of the optic nerves at the base of the brain. 2. Cell Biol. a point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis. Also, chiasm /kuy"az euhm/. [1830-40; < Gk: crosspiece of wood, cross-bandage, equiv. to chi CHI1 + -asma n. suffix] |
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