Definition of micro- in English:

micro-

Pronunciation: /ˈmʌɪkrəʊ/

combining form

1Small: microcar
1.1Of reduced or restricted size: microdot
2(Used in units of measurement) denoting a factor of one millionth (10−6): microfarad

Origin

from Greek mikros 'small'.

Definition of micro- in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal