planometry
pla·nom·e·ter
(plə-nŏm′ĭ-tər, plā-)n.
A flat metal plate for gauging the accuracy of a plane surface in precision metalworking. Also called surface plate.
pla·nom′e·try n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.