| wēi | micro/tiny/miniature/Taiwan pr. wei2 |
| 微 | surname Wei ancient Chinese state near present day Chongqing Taiwan pr. wei2 |
| 微不足道 | negligible insignificant |
| 微丝 | microfilament |
| 微丝血管 | capillary blood vessels |
| 微乎其微 | a tiny bit; very little; next to nothing (idiom) |
| 微亨利 | [Electrics] a microhenry |
| 微代码 | microcode; micro code |
| 微伏 | microvolt |
| 微伏特 | a microvolt |
| 微伏计 | [Electronics] a microvoltmeter |
| 微体 | microbody |
| 微体化石 | microfossil; microfossils |
| 微元 | [Mathematics] infinitesimal |
| 微光 | glimmer |
| 微光束 | microbeam |
| 微光视觉 | twilight vision; scotopic vision; dimlight vision |
| 微克 | milligram (mg) |
| 微分 | an infinitesimal differentiation differential calculus |
| 微分几何 | differential geometry |
| 微分几何学 | differential geometry |