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A system of natural drainage developed by the constituent streams through headwater erosion.

hward; the first point of Libra. -- ~= signs, the signs Libra, Scorpio, and Sagittarius, through which the sun passes between the ~ equinox and winter solstice.

A variety of translucent quartz, spangled throughout with scales of yellow mica. ~= feldspar, a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone.

A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are symmetrically arranged.

A bushing in the hub of a wheel, through which the axle passes.

f the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying.

Pulpy throughout, like a berry; -- said of fruits. Gray.

rn at the back of a stove, or a group of pipes set in the fire box of a stove or furnace, through which water circulates and is heated.

nciple; steadfastness. Shelley's thought never had any backbone. Shairp. To the backbone, through and through; thoroughly; entirely. "Staunch to the backbone." Lord Lytton.

The distance through which one part of connected machinery, as a wheel, piston, or screw, can be moved without moving the connected parts, resulting from looseness in fitting or from wear; also, the jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.…

A game played on an oblong board, having, at one end, cups or arches into or through which balls are to be driven by a rod held in the hand of the player.

A narrow opening, often cruciform, through which arrows might be discharged.

French versification, sometimes imitated in English, in which three or four rhymes recur through three stanzas of eight or ten lines each, the stanzas concluding with a refrain, and the whole poem with an envoy.

ed as a pendulum, for measuring the force and velocity of projectiles by means of the arc through which their impact impels it.

tte, said of guns when they are elevated so as to fire over the top of a parapet, and not through embrasures. -- Barbette gun, or Barbette battery, a single gun, or a number of guns, mounted in barbette, or partially protected by a parapet or turret. -- Barbette carriage, a gun carriage which elevates guns sufficient…

An opening in the wall of a fortress, through which missiles were discharged upon an enemy.

A very lean person; one whose bones show through the skin. Shak.

] and reason, what a nice barrier ! Pope. Barrier gate, a heavy gate to close the opening through a barrier. -- Barrier reef, a form of coral reef which runs in the general direction of the shore, and incloses a lagoon channel more or less extensive. -- To fight at barriers, to fight with a barrier between, as a mart…

ck; to cudgel. One man was basted by the keeper for carrying some people over on his back through the waters. Pepys.

A medium, as heated sand, ashes, steam, hot air, through which heat is applied to a body.