Definition of cullet in English:



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

    • ‘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.’
    • ‘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.’
    • ‘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.’


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