[pluh-nim-i-ter] 
| an instrument for measuring mechanically the area of plane figures. |
| pla·nim·e·ter (plə-nĭm'ĭ-tər, plā-) n. An instrument that measures the area of a plane figure as a mechanically coupled pointer traverses the perimeter of the figure. pla'ni·met'ric (plā'nə-mět'rĭk), pla'ni·met'ri·cal (-rĭ-kəl) adj., pla'ni·met'ri·cal·ly adv., pla·nim'e·try n. |
planimeter
mathematical instrument for directly measuring the area bounded by an irregular curve, and hence the value of a definite integral.
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