A hard, brittle substance typically transparent or translucent, made by fusing sand with soda, lime, and sometimes other ingredients and cooling rapidly.

The window was made of clear glass.

A container made of glass, used for drinking beverages.

She poured the juice into a glass.

A mirror.

He checked his reflection in the glass before leaving the house.

A magnifying lens or a device containing such a lens.

He used a glass to examine the small print.

A barometer or similar instrument for measuring atmospheric pressure.

The glass showed a drop in pressure, indicating a storm was coming.

An hourglass or sandglass used for measuring a fixed period of time.

The referee turned the glass to signal the start of the final minute.

Spectacles; a pair of eyeglasses (usually plural).

He forgot his glasses at home and couldn't read the road signs.

glassverb

To fit or furnish with glass.

The workers glassed the windows of the new building.

To coat or cover with a glassy substance.

The artist glassed the surface of the sculpture to give it a shiny finish.

To reflect or mirror, as if in glass.

The lake glassed the image of the mountains perfectly.

To make something smooth and shiny like glass.

The craftsman glassed the wooden table to enhance its appearance.

To examine or survey carefully with binoculars, a telescope, or another optical instrument.

The rangers glassed the distant ridge for signs of movement.

glassadjective

Made of, consisting of, or relating to glass.

She placed the flowers in a delicate glass vase.