(mineralogy) A soft stone used in artistic grinding and polishing, and for cleaning metallic substances. The name is also given to other friable siliceous stones applied to similar uses.

A flint slate used by the ancients to try gold and silver; a touchstone.

A crystal ball.

(historical) A weight formerly used in Scotland, approximately twenty pounds.

(topology, logic) A topological space constructed from a Boolean algebra, whose points are ultrafilters on the algebra.

A flowering plant, Aethionema grandiflorum.

a type of paper manufactured from calcium carbonate mixed with a high density polyethylene bonding agent

A mixed drink of cider with either rum, brandy, bourbon, or rye.

(printing, historical) The stone on which the pages or columns of type are imposed or made into forms.

plural of imposing stone