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.
Nearby words
prism bar, prism binocular, prism diopter, prism spectrometer, prismatic, prismatic compass, prismatic layer, prismatic telescope, prismatoid, prismoid, prison
Origin of prismatic compass
First recorded in 1850–55
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019