green-glass

green glass

noun
glass of low quality, colored green by impurities in the materials from which it is made.

Origin:
1650–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
green glass
 
n
glass in its natural colour, usually greenish as a result of metallic substances in the raw materials

Collins English Dictionary - Complete & Unabridged 10th Edition
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