Definition of perlite in English:


Line breaks: perl|ite
Pronunciation: /ˈpəːlʌɪt


[mass noun]
  • A form of obsidian consisting of glassy globules, used as insulation or in plant growth media.
    More example sentences
    • The mix we use contains compost, peat, perlite, rock phosphates, blood meal, calcite clay and gypsum.
    • With hot adhesives, however, it has to be paired with an insulation cover board of another type, such as perlite or wood fiber.
    • These soil mixtures should include sand, peat moss, perlite, vermiculite, and fir bark for adequate drainage.


mid 19th century: from French, from perle 'pearl'.

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