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perlite

[pur-lahyt] /ˈpɜr laɪt/
noun, Petrography
1.
a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.
Also, pearlite.
Origin
1825-1835
1825-35; < French; see pearl1, -ite1
Related forms
perlitic
[pur-lit-ik] /pɜrˈlɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for perlitic

perlite

/ˈpɜːlaɪt/
noun
1.
a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
Derived Forms
perlitic, pearlitic (pɜːˈlɪtɪk) adjective
Word Origin
C19: from French, from perlepearl1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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