float-glass

float glass

noun
extremely smooth, nearly distortion-free plate glass manufactured by pouring molten glass onto a surface of molten tin.

Origin:
1955–60

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World English Dictionary
float glass
 
n
a type of flat polished transparent glass made by allowing the molten glass to harden as it floats on liquid of higher density

Collins English Dictionary - Complete & Unabridged 10th Edition
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