perlite

noun

per·​lite ˈpər-ˌlīt 

: volcanic glass that has a concentric structure, appears as if composed of concretions, is usually grayish and sometimes spherulitic, and when heated expands to form a lightweight aggregate used especially in concrete and plaster and as a medium for potting plants

perlitic

ˌpər-ˈli-tik 

adjective

Examples of perlite in a Sentence

Recent Examples on the Web

Be careful not to over water, set your plant pots on drip trays and add perlite to the soil to help with drainage. —Dan Simms, USA Today, 15 May 2026

Quality potting mixes formulated for cucumbers can be found on the internet, or make your own with equal parts potting mix, compost, perlite, and peat. —Barbara Gillette, The Spruce, 12 May 2026

Potting soil has materials like perlite, volcanic rock and coir, said Resendes. —Caron Golden, San Diego Union-Tribune, 11 Apr. 2026

Amend the soil with perlite or vermiculite to enhance aeration and drainage, which prevents soil compaction and water-logging while promoting healthy root development, says Spoonemore. —Melissa Ozawa, Martha Stewart, 6 Apr. 2026

Word History

Etymology

French, from perle pearl

First Known Use

1833, in the meaning defined above

Rhymes for perlite

• pearlite

Kids Definition

perlite

noun

per·​lite ˈpər-ˌlīt 

: a glassy mineral of volcanic origin that when expanded by heat forms a lightweight material capable of absorbing liquids (as water)