A glass made to imitate agate by stacking glass layers of different colours and thickness and fusing them with heat.

(glassware) A kind of short but not small cylindric and often faux-crystal glass for distilled alcoholic beverage.

(chemistry, mining, geology, artisanship) Metastable glass of volcanic or dyke origin. / Alternative form of rocks glass (“short cylindrical liquor stoop”)

Alternative spelling of rock glass

(Cockney rhyming slang) arse

(idiomatic) An unwritten, uncodified barrier to further promotion or progression, in employment and elsewhere, for a member of a specific demographic group.

A pair of small low-powered binoculars for use at a theatrical performance.

(chemistry) A solution of sodium silicate in water.

A glass that holds a pint (of beer, etc).

A vessel of about 30ml volume, used for the measurement of spirituous liquors.