rectangulometern.
/rɛkˌtaŋɡjᵿˈlɒmᵻtə/, U.S. /rɛkˌtæŋɡjəˈlɑmədər/ rare.
An instrument used to determine whether an angle is a right angle.
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the world > relative properties > measurement > measuring instrument > [noun] > for measuring angles > right angles
squarea1300
squire1382
rectangulometer1847
1847 C. Holtzapffel Turning & Mech. Manip. II. xxviii. 880 When the work and trial-bar, (or rectangulometer), are both laid down, the one side of the bar presents a truly perpendicular face.
1968 I. Ehrlich Instant Vocab. 152 Rectangulometer, instrument for measuring right angles.
This entry has been updated (OED Third Edition, June 2009; most recently modified version published online March 2022).
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