from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A flat metal plate for gauging the accuracy of a plane surface in precision metalworking.

from The Century Dictionary.

  • noun A plane surface used in machine-making as a gage for plane surfaces; a surface-plate.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for gauging or testing a plane surface. See Surface gauge, under surface.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A flat, metal plate used for estimating the flatness of a machined part; a surface plate


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