Pierre, French mathematician, 1580–1637. See V. acuity.
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n.
a device for obtaining accurate measurements of length, to 1/10th, 1/100th or smaller fractions of a unit. It consists of a fixed graduated main scale against which a shorter vernier scale slides. The vernier scale is graduated into divisions equal to nine-tenths of the smallest unit marked on the main scale. The vernier scale is often adjusted by means of a screw thread. A reading is taken by observing which of the markings on the scales coincide.
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ver·ni·er (vurґne-ər) [Pierre Vernier] a finely graduated scale accessory to a more coarsely graduated one for measuring fractions of the divisions of the latter.Medical dictionary. 2011.