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vernier caliper

noun
  1. a caliper formed of two pieces sliding across one another, one having a graduated scale and the other a vernier.
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Origin of vernier caliper

First recorded in 1875–80
Also called vernier micrometer.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

vernier caliper in Science

vernier caliper

[vûrnē-ər]
  1. A measuring instrument consisting of an L-shaped frame with a linear scale along its longer arm and an L-shaped sliding attachment with a vernier scale, used to read directly the dimension of an object represented by the separation between the inner or outer edges of the two shorter arms.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.