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rotation-inversion axis

American  
[roh-tey-shuhn in-vur-zhuhn, -shuhn] / roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən /

noun

Crystallography.

  1. an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position.

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.