glass
n. C / Un. a hard, clear material that you can see through. It is used to make things like windows, bottles, and mirrors.
n. a hard, brittle, and typically transparent or translucent substance produced by fusing sand with soda and lime. Often used metonymically to refer to objects made from the material, such as drinking vessels or lenses.
Be careful not to break the glass window.
The architect chose to use recycled glass for the building's large front windows to let in more natural light.
Modern skyscrapers utilize specialized glass treated with metallic oxides to reflect solar radiation, significantly reducing the energy required for internal climate control during the summer months.
Uncountable when referring to the material itself; countable when referring to a drinking container or a specific lens.
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glass ceiling
An unrecognized or unwritten barrier to further progression or promotion, in employment and elsewhere, for a member of a specific demographic group (originally women).
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heart of glass
A heart (or by extension, person) in a very fragile romantic state: one that is easily made broken-hearted.
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throw stones in a glass house
To criticize others when one has similar weaknesses oneself.