broken or waste glass suitable for remelting.

1810–20; variant of collet < Italian colletto glass blower's term, literally, little neck. See col, -et Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cullet (ˈkʌlɪt)
waste glass for melting down to be reused
[C17: perhaps variant of collet (literally: little neck, referring to the glass neck of newly blown bottles, etc)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Cullet is made by melting down bottles and jars in a furnace which removes paper labels, glue, and other impurities.
Cullet contains no free silica, and comes in a variety of size.
The cullet is crushed and added to a raw material mix in a melting furnace.
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