scission
/ˈsɪʒən/noun
mass noun
1- technical the action or state of cutting or being cut, in particular〈技〉切割, 切断; 尤指：
1.1
- chiefly Biochemistry breakage of a chemical bond, especially one in a long chain molecule so that two smaller chains result【主生化】（化学键）断裂（尤指一长链分子中的化学键, 因断裂而产生两个较短的分子链）。
1.2
- count noun a division or split between people or parties; a schism（人群或政党间的）分裂。
词源
late Middle English:from Old French， or from late Latin scissio（n-）， from scindere 'cut， cleave'.