micro-
/ˈmaɪkrəʊ/combining form
1
- small表示“小的”, “微小的”, “微量的”：
microcar.
1.1
- of reduced or restricted size表示“缩微的”：
microdot.
2
- (used commonly in units of measurement) denoting a factor of one millionth (10-6)［用于计量单位］表示“微”, “百万分之一”：
microfarad.
词源
from Greek mikros 'small'.