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Knoop scale

American  
[noop] / nup /

noun

  1. a scale of hardness based on the indentation made in the material to be tested by a diamond point.

Etymology

Origin of Knoop scale

Named after F. Knoop, 20th-century American chemist

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.

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