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irrespirable

[ih-res-per-uh-buh l, ir-i-spahyuh r-uh-buh l]
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adjective
  1. not respirable; unfit for breathing.
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Origin of irrespirable

From the Late Latin word irrespīrābilis, dating back to 1815–25. See ir-2, respirable
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for irrespirable

irrespirable

adjective
  1. not fit for breathing or incapable of being breathed
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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