often attributive
1
: any of various amorphous materials formed from a melt by cooling to rigidity without crystallization: such as
a
: a usually transparent or translucent material consisting typically of a mixture of silicates
b
: a material (such as obsidian) produced by fast cooling of magma
2
b(1)
: an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seen
(2)
: field glasses, binoculars
—usually used in plural
c
glasses plural
: a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place
called also eyeglasses, spectacles
3
: the quantity held by a glass container
4
5
: crystal meth
specifically
: a pure form of crystal meth
glassed; glassing; glasses
1
a
: to provide with glass : glaze sense 1
b
: to enclose, case, or wall with glass
the sunroom was glassed in
2
: to make glassy
3
a
: reflect
b
: to see mirrored
4
: to look at through an optical instrument (such as a pair of binoculars)
Examples of glass in a Sentence
Noun
The waiter filled our glasses with water.
She drank two glasses of water.
She was wearing dark glasses with thick black frames.
Recent Examples on the Web
Mary Cornetta, Better Homes & Gardens, 29 Oct. 2025
As the scene unfolds, the gorilla suddenly lifts its arm and smacks the glass, causing a crack.
—Jordan Greene, PEOPLE, 29 Oct. 2025
Bob McNally, Outdoor Life, 2 Oct. 2025
That’s a common enough sacrifice on glassed-in upper floors, but surely there was a more elegant solution for the podium levels than placing a thick pillar squarely in the middle of a window.
—Justin Davidson, Curbed, 22 Sep. 2025
See All Example Sentences for glass
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Noun
Rinse all areas thoroughly with warm water, and then use a glass cleaner for streak-free doors.
—Mary Cornetta, Better Homes & Gardens, 29 Oct. 2025
As the scene unfolds, the gorilla suddenly lifts its arm and smacks the glass, causing a crack.
—Jordan Greene, PEOPLE, 29 Oct. 2025
Verb
Lierz stayed at the truck and glassed the pronghorn while Zutterman stalked slowly and quietly to the animal.
—Bob McNally, Outdoor Life, 2 Oct. 2025
That’s a common enough sacrifice on glassed-in upper floors, but surely there was a more elegant solution for the podium levels than placing a thick pillar squarely in the middle of a window.
—Justin Davidson, Curbed, 22 Sep. 2025
See All Example Sentences for glass
Cite this Entry
“Glass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/glass. Accessed 31 Oct. 2025.
Copy CitationKids Definition
glass
1 of 2 noun1
: a hard brittle usually transparent substance commonly formed by melting a mixture of sand and chemicals and cooling to hardness
2
a
: something (as a water tumbler, lens, mirror, barometer, or telescope) that is made of glass or has a glass lens
b
plural
: a pair of glass or plastic lenses held in a frame and used to help one see clearly or to protect the eyes
3
: the quantity held by a glass
glass
2 of 2 verb
: to fit or protect with glass
Medical Definition
glass
nounoften attributive
1
a
: an amorphous inorganic usually transparent or translucent substance consisting of a mixture of silicates or sometimes borates or phosphates formed by fusion of silica or of oxides of boron or phosphorus with a flux and a stabilizer into a mass that cools to a rigid condition without crystallization
b
: a substance resembling glass especially in hardness and transparency
organic glasses made from plastics
2
a
: an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seen
b
glasses plural
: a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place
called also eyeglasses
Biographical Definition
Glass
2 of 2biographical name (2)
Philip 1937– American composer
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