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d concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope,…

Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color. It is employed to test the purity of gold, the amount of alloy being indicated by the color left on the stone when rubbed by the metal.

of the eyeballs, and inordinate action of the heart; -- called also exophthalmic goiter. Flint.

A vessel made of osiers or other twigs, cane, rushes, splints, or other flexible material, interwoven. "Rude baskets . . . woven of the flexile willow." Dyer.

That part of any member of a building which rests upon its supports; as, a lintel or beam may have four inches of bearing upon the wall.

ieces when its surface is scratched by a hard body, as by dropping into it a fragment of flint; whereas a bullet may be dropped into it without injury.

a building flush with, and supporting, the upper part of a front or external wall; a long lintel; a girder; -- used principally above shop windows. [Written also brestsummer and bressummer.]

ed or yellow. Cheeks brown as the oak leaves. Longfellow. Brown Bess, the old regulation flintlock smoothbore musket, with bronzed barrel, formerly used in the British army. -- Brown bread (a) Dark colored bread; esp. a kind made of unbolted wheat flour, sometimes called in the United States Graham bread. "He would mo…

A cellular, flinty rock, used for mill stones. [Written also burrstone.]

ulling by the bushes, as in hauling a boat along the bushy margin of a stream. [U.S.] T. Flint.

Flint or pebble stone, used in building walls, etc. Haliwell.

An upward concavity in the under side of a beam, girder, or lintel; also, a slight upward concavity in a straight arch. See Hogback. Camber arch (Arch.), an arch whose intrados, though apparently straight, has a slightly concave curve upward. -- Camber beam (Arch.), a beam whose under side has a concave curve upward.…

he Canadian period of the American Lower Silurian system; -- so named from a township in Clinton Co., New York. See the Diagram under Geology.

An impure, massive, flintlike quartz or hornstone, of a dull color.

Like chert; containing chert; flinty.

An apple-green variety of chalcedony, colored by nickel. It has a dull flinty luster, and is sometimes used in jewelry.

compassion. And pluck commiseration of his state From brassy bosoms and rough hearts of flint. Shak.

A folded piece of cloth, pledget of lint, etc., used to cover the dressing of wounds, and so placed as, by the aid of a bandage, to make due pressure on any part.

ion or mass formed by concretion, or natural union. [Obs.] The concrement of a pebble or flint. Sir M. Hale

composition and manufacture than common glass, and often cut into ornamental forms. See Flint glass.