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1) A unit of length that is equal to one millionth of a meter or one thousandths of a millimeter. An old, but still common, name for micrometer is micron. The preferred SI (International System of Units) term is micrometer.

2) A precision instrument used to accurately measure thickness, distance or angles of small areas or thin materials. Micrometers are often used in conjunction with a microscope.

Synonyms and Related Terms

micron; um; Mikrometer (Deut.); micromètre (Fr.);

Sources Checked for Data in Record

  • Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

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