1 [mass noun] a hard, brittle substance, typically transparent or translucent, made by fusing sand with soda and lime and cooling rapidly. It is used to make windows, drinking containers, and other articles:the screen is made from glass [as modifier]:a glass door
a substance similar to glass which has solidified from a molten state without crystallizing:the black volcanic glass makes the beaches sparkle
glassware:we sell china and glass
greenhouses or cold frames considered collectively:lettuces grown under glass
2a drinking container made from glass:a beer glass
the contents of a glass:have a glass of wine
3a lens, or an optical instrument containing a lens or lenses, in particular a monocle or a magnifying lens.
4chiefly British a mirror:she couldn’t wait to put the dress on and look in the glass
dated a weather glass.
archaic an hourglass:every hour the ship’s glass was turned
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Universal
1cover or enclose with glass:the inn has a long gallery, now glassed in
2(especially in hunting) scan (one’s surroundings) with binoculars:the first day was spent glassing the rolling hills
3British informal hit (someone) in the face with a beer glass:he glassed the landlord because he’d been chatting to Jo
the glass is half-full (or half-empty)
used to refer to an optimistic (or pessimistic) outlook on life:she remains a person for whom the glass is always half-full, not half-emptyI like to think of myself as a glass half-full kind of guy
people (who live) in glass houses shouldn't throw stones
proverb you shouldn’t criticize others when you have similar faults of your own.
