an instrument for measuring mechanically the area of plane figures.

1855–60; plani- + -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
planimeter (plæˈnɪmɪtə)
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 10th Edition
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Encyclopedia Britannica


mathematical instrument for directly measuring the area bounded by an irregular curve, and hence the value of a definite integral.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The value indicated on the planimeter is converted to land area by using an
  appropriate conversion factor related to map scale.
Field measurements were made from aerial enlargements with a planimeter.
Ability to compute acreages using a calculator, planimeter, or computer.
Integration was done with a calibrated polar planimeter.
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