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A single particle of ice falling from a cloud; a frozen raindrop; a pellet of hail.

The principal stone in a foundation; the chief or corner stone. Ps. cxviii. 22.

Stone forming the hearth; hence, the fireside; home. Chords of memory, stretching from every battlefield and patriot grave to every living heart and hearthstone. A. Lincoln.

A stone designating the Halliwell.

A stone used by seamen for scrubbing the decks of ships. Totten.

See Mellite.

A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert.

A kind of stone containing native vitriol or subphate of iron, used in making ink.

Any very hard rock.

A hard, earthy ore of iron. Clay ironstone. See under Clay. -- Ironstone china, a hard white pottery, first made in England during the 18th century.

One of the pebbles or pieces used in the game of jackstones.

A large clavate spine of a fossil sea urchin.

See Curbstone.

The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch. Keystone State, the State of Pennsylvania; -- so called from its having been the central State of the Union at the formation of the Constitutio…

Pennsylvania; -- a nickname alluding to its having been the central one of the 13 original United States.

The black angel fish. See Angel fish, under Angel.

See Clinkstone.

A block upon which ore is broken up.

A stone for the lap, on which shoemakers beat leather.

ometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.