transcription, транскрипция: [ ˈpər-ˌlīt ]
noun
Etymology: French, from perle pearl
Date: 1833
: volcanic glass that has a concentric shelly structure, appears as if composed of concretions, is usually grayish and sometimes spherulitic, and when expanded by heat forms a lightweight aggregate used especially in concrete and plaster and as a medium for potting plants
• per·lit·ic ˌpər-ˈli-tik adjective