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V block

American  

noun

  1. a block having a precise V -shaped groove for checking the roundness or concentricity of a machine part or the like, or for holding cylindrical pieces of work.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.