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micro- Definition

micro- (mī′krō, -krə)

    1. little, small, minute microcosm
    2. exceptionally little, abnormally small microcephaly
  2. enlarging or amplifying microscope, microphone
  3. involving microscopes, microscopic micrography
  4. one millionth part of; the factor 10: symbol μ microsecond

Etymology: Gr mikro- < mikros, small < IE *(s)meik-: see mica