Definition of cullet in English:

cullet

noun

mass noun
  • Recycled broken or waste glass used in glass-making.

    • ‘Ireland does not have another manufacturing facility with a similar capacity to absorb glass cullet (crushed glass).’
    • ‘Approximately 80 per cent of the glass now being made in Irish Glass is from cullet or recycled glass.’
    • ‘It goes without saying that the broken glass or cullet used had to be of the required colour or clear, so that no expensive new minerals were added to colour it.’
    • ‘For some purposes, it is possible to make glass entirely of cullet.’
    • ‘One of our earliest industrial containers, glass is made by melting sand, soda ash, limestone, and cullet (recycled crushed glass) in furnaces heated to 2,700 degrees Fahrenheit.’

Origin

Early 19th century: variant of collet, in the obsolete sense ‘glass left on the blowing-iron when the finished article is removed’.

Pronunciation

cullet

/ˈkʌlɪt/