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micromillimeter 微毫米 微毫米 micromillimeter n 1: a metric unit of length equal to one billionth of a meter [synonym: {nanometer}, {nanometre}, {nm}, {millimicron}, {micromillimeter}, {micromillimetre}] Micromillimeter \Mi`cro*mil"li*me`ter\, n. [Micro-
millimeter.] The millionth part of a meter. Note: The millionth part of a meter is now termed a {micron}, and the word micromillimeter does not conform to the IS use of the prefix {micro-}. [1913 Webster PJC]
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