Definition of micro- in English:

micro-

Syllabification: micro-

combining form

2(Used commonly 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 rebuff
Pronunciation: rɪˈbʌf
verb
reject (someone or something) in an abrupt manner…