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irrefrangible

[ir-i-fran-juh-buh l]
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adjective
  1. not to be broken or violated; inviolable: an irrefrangible rule of etiquette.
  2. incapable of being refracted.
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Origin of irrefrangible

First recorded in 1710–20; ir-2 + refrangible
Related formsir·re·fran·gi·bil·i·ty, ir·re·fran·gi·ble·ness, nounir·re·fran·gi·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for irrefrangible

irrefrangible

adjective
  1. not to be broken or transgressed; inviolable
  2. physics incapable of being refracted
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Derived Formsirrefrangibility or irrefrangibleness, nounirrefrangibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for irrefrangible

adj.

c.1719, "that cannot be broken," from assimilated form of in- "not, opposite of" (see in- (1)) + refrangible.

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Online Etymology Dictionary, © 2010 Douglas Harper