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(usually uncountable) An amorphous solid, often transparent substance, usually made by melting silica sand with various additives (for most purposes, a mixture of soda, potash and lime is added).
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(countable, uncountable, by extension) Any amorphous solid (one without a regular crystal lattice).
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(countable) A vessel from which one drinks, especially one made of glass, plastic, or similar translucent or semi-translucent material.
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(metonymic) The quantity of liquid contained in such a vessel.
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(uncountable) Glassware.
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A mirror.
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A magnifying glass or telescope.
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(sports) A barrier made of solid, transparent material.
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A barometer.
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(attributive, in names of species) Transparent or translucent.
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(obsolete) An hourglass.
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(uncountable, photography, informal) Lenses, considered collectively.
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(countable, now rare) Synonym of window or pane, particularly in vehicles.