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micro-

prefix (SMALL)
 
 
/maɪ.krəʊ-/ /-rə-/ US  /-kroʊ-/

Definition

very small: a microorganism microbiology → Compare macro-Extremely smallSmall
(Definition of micro- prefix (SMALL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of micro-