A chemical element, symbol Pb, atomic number 82, atomic weight 207.19.

The distance that a screw will advance or move into a nut in one complete turn.

A wire used to connect two points in a circuit.

A mass of lead attached to a line, as used for sounding at sea.

A small, narrow passage in a cave.

A thin strip of metal used during the composition process to space lines of type.

A soft, heavy metal with a silvery-bluish color; when freshly cut it is malleable and ductile; occurs naturally, mostly in combination; used principally in alloys in pipes, cable sheaths, type metal, and shields against radioactivity.

1. The action of aiming ahead of a moving target with a gun, bomb, rocket, or torpedo so as to hit the target, including whatever action is necessary to correct for deflection.

2. The distance between the moving target and the point at which the gun or missile is aimed.

3. The number of diameters for one complete turn of the rifling.

4. An explosive train component which consists of a column of high explosive, usually small in diameter, used to transmit detonation from one detonating component to a succeeding high explosive component; it is generally used to transmit the detonation from a detonator to a booster charge.

See <<lead angle>>