planimetric

enUK

pla·nim·e·ter

P0350500 (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-mĕt′rĭk), pla′ni·met′ri·cal (-rĭ-kəl) adj.pla·nim′e·try n.