planimeter

[ pluh-nim-i-ter ]
/ pləˈnɪm ɪ tər /
|

noun

an instrument for measuring mechanically the area of plane figures.

Origin of planimeter

First recorded in 1855–60; plani- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for planimeter

planimeter

/ (plæˈnɪmɪtə) /

noun

a mechanical integrating instrument for measuring the area of an irregular plane figure, such as the area under a curve, by moving a point attached to an arm around the perimeter of the figure

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