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Entries starting with S

965 entries.

spline

A strip of wood or other material inserted into grooves in each of two pieces of wood to provide additional surface for gluing.

split rim

A wheelrim consisting of several connected pieces, generally used on large and heavy vehicles.

split slab

A method of construction using two separate concrete slabs: the first placed as a slab on grade or suspended slab and covered with waterproofing and a drainage system; the second, or topping slab, placed over the underlying slab and waterproofing.

split-phase power

A type of electrical power distribution system using two line wires connected to the ends of a distribution transformer and a grounded neutral wire connected to the center tap of the transformer, allowing loads to be connected between line and neutral and receive the normal line voltage (120 or 240 volts), or between the two opposite-phase line wires and receive twice the normal line voltage (240 or 480 volts).

spoil

To reduce the lift generated by an airplane or wing by deflecting air upwards, usually with a spoiler.

spool

One of the rotating assemblies of a gas turbine engine, composed of one or more turbine stages, a shaft, and one or more compressor or fan stages.

spot

To position (a locomotive or car) at a predetermined point, e.g., for loading or unloading.

spot beam

A satellite signal that is specially concentrated in power (i.e. sent by a high-gain antenna) so that it will cover only a limited geographic area on Earth.

spray

A side channel or branch of the runner of a flask, made to distribute the metal to all parts of the mold.

spring saddle

A bent metal bar on the top of a railway carriage journal-box, surrounding the arch-bar and supporting the spring.

spruce tip

The new spring growth at the ends of spruce branches. For some species of spruce, these are edible and a traditional foodstuff.

sprue

A channel through which molten metal is poured into the mold during the casting process.

spud

A type of short nut (fastener) threaded on both ends.

spud washer

A flanged rubber or foam ring that covers the spud nut on the flush mechanism of a toilet, cushioning the tank-bowl juncture to prevent leaks.

spudger

A hand tool used to work on punch-down blocks without short circuiting electric terminals. It has a hook on one end and a notched blade on the other.

spunlaid

adjectiveManufacturing

In which fibres are spun and then directly dispersed into a web by deflectors or air streams.

spur

A brace strengthening a post and some connected part, such as a rafter or crossbeam; a strut.

square

A unit used in measuring roof area equivalent to 100 square feet (9.29 m²) of roof area. The materials for roofing jobs are often billed by the square in the United States.

squelch

To suppress the unwanted hiss or static between received transmissions by adjusting a threshold level for signal strength.

squib

The heating element used to set off the sodium azide pellets in a vehicle's airbag.

SRB

Initialism of solid rocket booster, NASA term for booster rockets that use solid rocket fuel and provide additional thrust to a main rocket.

SRC

Initialism of Short Range Certificate (certificate that entitles the holder to operate a maritime VHF radio).

SRM

Initialism of standard reference material (“a standardized material of known composition used as a reference, to calibrate testing equipment, to validate testing equipment, to test materials and equipment”).

SRS

Initialism of supplemental restraint system or secondary restraint system (car airbags).