per·lite

[pur-lahyt]
noun Petrography.
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:
1825–35; < French; see pearl1, -ite1

per·lit·ic [pur-lit-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
perlite or pearlite (ˈpɜːlaɪt) [Click for IPA pronunciation guide]
 
n
a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
 
[C19: from French, from perlepearl1]
 
pearlite or pearlite
 
n
 
[C19: from French, from perlepearl1]
 
perlitic or pearlite
 
adj
 
pearlitic or pearlite
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Perlite is always a great word to know.
So is lollapalooza. Does it mean:
a fool or simpleton; ninny.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Example sentences
Processed perlite is used as loose fill insulation material or bound into slabs.
Concrete blocks are also sometimes filled with vermiculite or perlite pellets.
Older homes may have granular vermiculite or perlite loose-fill insulation that
  is no longer used.
Citrus can be grown in a mixture of equal parts of peat, perlite, and a good
  garden loam.
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