- irreducible (adj.)
[irreducible 词源字典]
- 1530s, from assimilated form of in- (1) "not, opposite of" + reducible. Related: Irreducibly; irreducibility.[irreducible etymology, irreducible origin, 英语词源]
- reducible (adj.)
- mid-15c.; see reduce + -ible. Compare Old French redusible.