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Pertaining to the periodic return of the moon to its perigee, or of the earth to its perihelion

Related Terms

OIL SEAL

1. A device for preventing the entry or return of oil from a chamber. 2. A device using oil as the sealing medium to prevent the passage of fluid from one chamber to another.

OFFSET VOLTAGE

The differential input voltage that must be applied to an operational amplifier to return the zero-frequency output voltage to zero volts, due to device mismatching at the input stage.

IONOSONDE

A radar system for determining the vertical height at which the ionosphere reflects signals back to earth at various frequencies; a pulsed vertical beam is swept periodically through a frequency range from 0.5 to 20 megahertz, and the variation of echo return time with frequency is photographically recorded.

BREAKDOWN MAINTENANCE

Maintenance performed after a machine has failed to return it to an operating state.

BACK PRESSURE

The pressure encountered on the return side of a system.

VANISHING ANGLE

The maximum degree of heel after which a vessel becomes unable to return to an upright position.

DEADHEAD

When a truck returning from a delivery has no return freight on the back haul, it is said to be in deadhead.

BACKRUSH

The seaward return of water following the uprush onto the foreshore

CORNER REFLECTOR

A radar reflector consisting of three mutually perpendicular flat reflecting surfaces designed to return incident electro- magnetic radiation toward its source. The reflector is used to render objects such as buoys and sailboats more conspicuous to radar observations. Since maximum effectiveness is obtained when the incident beam coincides with the axis of symmetry of the reflector, clusters of reflectors are sometimes used to insure that the object will be a good reflector in all directions. Also called TRIHEDRAL REFLECTOR.

RETREAT SIGNAL

Sound, visual or other signal to a team ordering it to return to its base

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