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

Tips For Proper Watering Plant succulents in fast-draining soil that’s sandy, such as a cactus mix that contains pumice or perlite. — Karen Brewer Grossman, Southern Living, 19 July 2026

Take cuttings from woody herbs, such as rosemary and lavender, and root them in a well-draining medium, like perlite or moist sand. — Erica Browne Grivas, Better Homes & Gardens, 16 July 2026

Ford recommends using a nutrient-poor carnivorous plant compost, such as sphagnum peat mixed with perlite or silica sand. — Sj McShane, Martha Stewart, 14 July 2026

If using a commercial houseplant soil, add some extra perlite and/or orchid bark to lighten it up a bit. — Dr. Matthew Lisy, Hartford Courant, 21 June 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)