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

Stem cuttings root faster; use healthy 2-inch sections with buds and place in perlite or moss. — Derek Carwood, Better Homes & Gardens, 27 Sep. 2026

Potting soils have not contained soil from the ground for years, and have been mainly combinations of peat moss, perlite and vermiculite. — Tom MacCubbin, The Orlando Sentinel, 19 Sep. 2026

Soil Use rich, well-draining soil like standard potting mix or a blend of potting soil, compost, and perlite. — Karen Brewer Grossman, Southern Living, 1 Sep. 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

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)