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Planimeter
CIDE DICTIONARY
Planimeter, n. [Plani- + -meter. Cf. Planometer.].
An instrument for measuring the area of any plane figure, however irregular, by passing a tracer around the bounding line; a platometer. [1913 Webster]
OXFORD DICTIONARY
Planimeter, n. an instrument for mechanically measuring the area of a plane figure.
Derivative
planimetric adj. planimetrical adj. planimetry n.
Etymology
F planim{egrave}tre f. L planus level
For further exploring for "Planimeter" in Webster Dictionary Online