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micro-
- little, small, minute: microcosm
- exceptionally little, abnormally small: microcephaly
- enlarging or amplifying: microscope, microphone
- involving microscopes, microscopic: micrography
- one millionth part of; the factor 10: symbol μ: microsecond
Also, before a vowel, micr-
See micro- in American Heritage Dictionary 4
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