WordReference Random House Unabridged Dictionary of American English © 2026
sur′face plate′, 
  1. Mechanical Engineering[Mach.]a flat plate used by machinists for testing surfaces that are to be made perfectly flat. Also called planometer. 
  • 1840–50

'surface plate' also found in these entries (note: many are not synonyms or translations):
planometer

Forum discussions with the word(s) "surface plate" in the title:


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