American English

Definition of micro- combining form from the Oxford Advanced American Dictionary

     

    micro-

     combining form
    combining form
    NAmE//ˈmaɪkroʊ//
     
    , NAmE//ˈmaɪkrə//
     
     
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  1. 1(in nouns, adjectives, and adverbs) small; on a small scale microchip microorganism opposite macro-
  2. 2 (in nouns; used in units of measurement) one millionth a microlitre
See the Oxford Advanced Learner's Dictionary entry: micro-