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

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

Impatiens, geranium, coleus, and begonias root easily in water, damp perlite, or seed starting mix, says Hancock. —Erica Browne Grivas, Better Homes & Gardens, 30 Sep. 2024

Media with perlite, sand, or other materials to improve drainage are ideal. —Kim Toscano, Southern Living, 14 Sep. 2024

Seeds: Prepare a seed flat or several small pots with a peat moss and perlite mix. —Viveka Neveln, Better Homes & Gardens, 8 May 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)