prismatic compass

noun

a hand compass equipped with sights and prisms to permit aiming the instrument at a point and at the same time reading the compass direction of the point.

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Origin of prismatic compass

First recorded in 1850–55

Words nearby prismatic compass

prism bar, prism binocular, prism diopter, prism spectrometer, prismatic, prismatic compass, prismatic layer, prismatic telescope, prismatoid, prismoid, prison