What do a.m. and p.m. stand for?

surface plate

Machinery. a flat plate used by machinists for testing surfaces that are to be made perfectly flat.
Also called planometer.
Origin of surface plate
1840-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for surface plate
  • The calibration process which is described is fairly simple and requires two mirrors, two autocollimators, and a surface plate.
  • Openings with sleeves cast in place in masonry do not require fasteners into the surface plate.
British Dictionary definitions for surface plate

surface plate

another name for faceplate (sense 2)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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