or pearl·ite

[ pur-lahyt ]
/ ˈpɜr laɪt /

noun Petrography.

a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.

Origin of perlite

From French, dating back to 1825–35; see origin at pearl1, -ite1
Related formsper·lit·ic [pur-lit-ik] /pɜrˈlɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for perlite

British Dictionary definitions for perlite



/ (ˈpɜːlaɪt) /


a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
Derived Formsperlitic or pearlitic (pɜːˈlɪtɪk), adjective

Word Origin for perlite

C19: from French, from perle pearl 1
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