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isopyre

American  
[ahy-suh-pahyuhr] / ˈaɪ səˌpaɪər /

noun

Mineralogy.

  1. an impure variety of opal, containing alumina, lime, and iron sesquioxide.

Etymology

Origin of isopyre

1820–30; iso- + Greek pŷr fire

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.