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An opposed-piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head. Petrol and diesel opposed-piston engines...

engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, whereby each cylinder...

chemistry, a double bond is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond. Double bonds occur most...

A double tap is a shooting technique where two shots are fired in rapid succession at the same target with the same sight picture (as opposed to the controlled...

The Double Down is a sandwich offered by Kentucky Fried Chicken (KFC) restaurants. It has two pieces of fried chicken fillet, as opposed to bread, containing...

In the field of counterintelligence, a double agent is an employee of a secret intelligence service for one country, whose primary purpose is to spy on...

replaced. The double bass bow is strung with either white or black horsehair, or a combination of the two (known as "salt and pepper"), as opposed to the customary...

Double-clutching (also called double de-clutching outside of the United States) is a method of shifting gears used primarily for vehicles with an unsynchronized...

It is a form of overdubbing; the distinction comes from the doubling of a part, as opposed to recording a different part to go with the first. The effect...

to refer to a specific type of Japanese straight, double-edged sword used in antiquity (as opposed to curved, single-edged swords such as the katana)...

rodents have a double uterus (uterus duplex). In other animals (e.g. nematodes), the term 'didelphic' refers to a double genital tract, as opposed to monodelphic...

A double-decker bus or double-deck bus is a bus that has two storeys or decks. Double-deckers are primarily for commuter transport, but open-top models...

In jurisprudence, double jeopardy is a procedural defence (primarily in common law jurisdictions) that prevents an accused person from being tried again...

most double-action guns feature the optional ability to cock the hammer separately, reducing the trigger to perform just one action. This is opposed to...

crossing the line will place a driver in a lane where opposing traffic is coming at the driver. A double yellow line is a painted marking separating two lanes...

Double-layer capacitance is the important characteristic of the electrical double layer which appears at the interface between a surface and a fluid (for...

In surface science, a double layer (DL, also called an electrical double layer, EDL) is a structure that appears on the surface of an object when it is...

run) is negated. Doubling a runner off is considered a "time play" (as opposed to a force play), which means that even if the doubling-off is the third...

of regular season triple-double leaders showing how the record increased through the years. A list of facts of triple-double achievements. Statistics...

of two blocks attached to rollers which facilitate opposing movement along a set of rails. Double hammers are normally operated by three people at a time:...