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

For best results, choose a well-draining, terracotta pot that’s just one or two sizes larger than the plant’s original growing container and repot your plant using a potting mix blended with sand, perlite, or bark for faster drainage. —Lauren Landers, Better Homes & Gardens, 19 Dec. 2024

Use a well-draining rooting medium such as sand or perlite. —Kim Toscano, Southern Living, 13 Dec. 2024

Dip the ends of cuttings in a rooting hormone and stick them in a mixture of sand and perlite. —Rita Pelczar, Better Homes & Gardens, 20 Nov. 2024

Three parts potting soil mixed with two parts perlite will provide good drainage. —Kim Toscano, Southern Living, 26 Oct. 2024

Word History

Etymology

French, from perle pearl

First Known Use

1833, in the meaning defined above

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)