center n. 1.A point equally distant from the extremities of a line, figure, or body, or from all parts of the circumference of a circle; the middle point or place.
2.The middle or central portion of anything.
3.A principal or important point of concentration; the nucleus around which things are gathered or to which they tend; an object of attention, action, or force; as, a center of attraction.
5.Those members of a legislative assembly (as in France) who support the existing government. They sit in the middle of the legislative chamber, opposite the presiding officer, between the conservatives or monarchists, who sit on the right of the speaker, and the radicals or advanced republicans who occupy the seats on his left, See Right, and Left. 6.(Arch.) A temporary structure upon which the materials of a vault or arch are supported in position until the work becomes self-supporting.
7.(Mech.) (a)One of the two conical steel pins, in a lathe, etc., upon which the work is held, and about which it revolves.
(b)A conical recess, or indentation, in the end of a shaft or other work, to receive the point of a center, on which the work can turn, as in a lathe. Note: In a lathe the live center is in the spindle of the head stock; the dead center is on the tail stock. Planer centers are stocks carrying centers, when the object to be planed must be turned on its axis.
Center of an army, the body or troops occupying the place in the line between the wings.
Center of a curve or Center of a surface (Geom.) (a)A point such that every line drawn through the point and terminated by the curve or surface is bisected at the point.
(b)The fixed point of reference in polar coordinates. See Coordinates. Center of curvature of a curve (Geom.), the center of that circle which has at any given point of the curve closer contact with the curve than has any other circle whatever. See Circle. Center of a fleet, the division or column between the van and rear, or between the weather division and the lee.
Center of gravity (Mech.), that point of a body about which all its parts can be balanced, or which being supported, the whole body will remain at rest, though acted upon by gravity.
Center of gyration (Mech.), that point in a rotating body at which the whole mass might be concentrated (theoretically) without altering the resistance of the intertia of the body to angular acceleration or retardation.
Center of inertia (Mech.), the center of gravity of a body or system of bodies.
Center of motion, the point which remains at rest, while all the other parts of a body move round it.
Center of oscillation, the point at which, if the whole matter of a suspended body were collected, the time of oscillation would be the same as it is in the actual form and state of the body.
Center of percussion, that point in a body moving about a fixed axis at which it may strike an obstacle without communicating a shock to the axis.
Center of pressure (Hydros.), that point in a surface pressed by a fluid, at which, if a force equal to the whole pressure and in the same line be applied in a contrary direction, it will balance or counteract the whole pressure of the fluid.
Dead adj. 1.Deprived of life; opposed to alive and living; reduced to that state of a being in which the organs of motion and life have irrevocably ceased to perform their functions; as, a dead tree; a dead man. "The queen, my lord, is dead." "The crew, all except himself, were dead of hunger." "Seek him with candle, bring him dead or living."
2.Destitute of life; inanimate; as, dead matter.
3.Resembling death in appearance or quality; without show of life; deathlike; as, a dead sleep.
4.Still as death; motionless; inactive; useless; as, dead calm; a dead load or weight.
5.So constructed as not to transmit sound; soundless; as, a dead floor.
6.Unproductive; bringing no gain; unprofitable; as, dead capital; dead stock in trade.
7.Lacking spirit; dull; lusterless; cheerless; as, dead eye; dead fire; dead color, etc.
8.Monotonous or unvaried; as, a dead level or pain; a dead wall. "The ground is a dead flat."
9.Sure as death; unerring; fixed; complete; as, a dead shot; a dead certainty. "I had them a dead bargain."
10.Bringing death; deadly.
11.Wanting in religious spirit and vitality; as, dead faith; dead works. "Dead in trespasses."
12.(Paint.) (a)Flat; without gloss; said of painting which has been applied purposely to have this effect.
(b)Not brilliant; not rich; thus, brown is a dead color, as compared with crimson.
13.(Law) Cut off from the rights of a citizen; deprived of the power of enjoying the rights of property; as, one banished or becoming a monk is civilly dead.
14.(Mach.) Not imparting motion or power; as, the dead spindle of a lathe, etc. See Spindle. 15.(Elec.) Carrying no current, or producing no useful effect; said of a conductor in a dynamo or motor, also of a telegraph wire which has no instrument attached and, therefore, is not in use.
16.Out of play; regarded as out of the game; said of a ball, a piece, or a player under certain conditions in cricket, baseball, checkers, and some other games. "(In golf), a ball is said to lie dead when it lies so near the hole that the player is certain to hole it in the next stroke."
Dead ahead (Naut.), directly ahead; said of a ship or any object, esp. of the wind when blowing from that point toward which a vessel would go.
Dead angle (Mil.), an angle or space which can not be seen or defended from behind the parapet.
Dead block, either of two wooden or iron blocks intended to serve instead of buffers at the end of a freight car.
Dead calm (Naut.), no wind at all.
Dead center, or Dead point (Mach.), either of two points in the orbit of a crank, at which the crank and connecting rod lie a straight line. It corresponds to the end of a stroke; as, A and B are dead centers of the crank mechanism in which the crank C drives, or is driven by, the lever L.
Dead color (Paint.), a color which has no gloss upon it.
Dead coloring (Oil paint.), the layer of colors, the preparation for what is to follow. In modern painting this is usually in monochrome.
Dead door (Shipbuilding), a storm shutter fitted to the outside of the quarter-gallery door.
Dead flat (Naut.), the widest or midship frame.
Dead freight (Mar. Law), a sum of money paid by a person who charters a whole vessel but fails to make out a full cargo. The payment is made for the unoccupied capacity.
Dead ground (Mining), the portion of a vein in which there is no ore.
Dead hand, a hand that can not alienate, as of a person civilly dead. "Serfs held in dead hand." See Mortmain. Dead head (Naut.), a rough block of wood used as an anchor buoy.
Dead heat, a heat or course between two or more race horses, boats, etc., in which they come out exactly equal, so that neither wins.
Dead horse, an expression applied to a debt for wages paid in advance. (Law)
Dead language, a language which is no longer spoken or in common use by a people, and is known only in writings, as the Hebrew, Greek, and Latin.
Dead letter. (a)A letter which, after lying for a certain fixed time uncalled for at the post office to which it was directed, is then sent to the general post office to be opened.
(b)That which has lost its force or authority; as, the law has become a dead letter.
Dead-letter office, a department of the general post office where dead letters are examined and disposed of.
Dead level, a term applied to a flat country.
Dead lift, (a)a direct lift, without assistance from mechanical advantage, as from levers, pulleys, etc.; hence, an extreme emergency. "(As we say) at a dead lift."
(b)(Weighlifting) The lifting of a weight from the ground, without raising it to the shoulders.
Dead line (Mil.), a line drawn within or around a military prison, to cross which involves for a prisoner the penalty of being instantly shot.
Dead load (Civil Engin.), a constant, motionless load, as the weight of a structure, in distinction from a moving load, as a train of cars, or a variable pressure, as of wind.
Dead march (Mus.), a piece of solemn music intended to be played as an accompaniment to a funeral procession.
Dead nettle (Bot.), a harmless plant with leaves like a nettle (Lamium album).
Dead oil (Chem.), the heavy oil obtained in the distillation of coal tar, and containing phenol, naphthalus, etc.
Dead plate (Mach.), a solid covering over a part of a fire grate, to prevent the entrance of air through that part.
Dead pledge, a mortgage. See Mortgage. Dead point. (Mach.) See Dead center.
Dead reckoning (Naut.), the method of determining the place of a ship from a record kept of the courses sailed as given by compass, and the distance made on each course as found by log, with allowance for leeway, etc., without the aid of celestial observations.
Dead rise, the transverse upward curvature of a vessel's floor.
Dead rising, an elliptical line drawn on the sheer plan to determine the sweep of the floorheads throughout the ship's length.
Dead-Sea apple. See under Apple. Dead shot. (b)A shot certain to be made.
Dead smooth, the finest cut made; said of files.
Dead wall (Arch.), a blank wall unbroken by windows or other openings.
Dead water (Naut.), the eddy water closing in under a ship's stern when sailing.
Dead weight. (a)A heavy or oppressive burden.
(b)(Shipping) A ship's lading, when it consists of heavy goods; or, the heaviest part of a ship's cargo.
(c)(Railroad) The weight of rolling stock, the live weight being the load.
Dead wind (Naut.), a wind directly ahead, or opposed to the ship's course.
To be dead, to die. (Obs.) "I deme thee, thou must algate be dead."
Synonyms: Inanimate; deceased; extinct. See Lifeless. 
...
