Refers to a large molecule, usually but not exclusively of DNA, which has been created by combining fragments from other molecules. Recombinant DNA therefore is a DNA molecule that comprises fragments of DNA from more than one source. The term is also...

An internal COMBUSTION engine in which the pistons move back and forth (i.e. they ‘reciprocate’) (impelled by an explosive mixture) inside a cylinder to produce a rotating motion in a crankshaft. See also: ROTARY...

A reciprocating engine, also often known as a piston engine, is a heat engine that uses one or more pistons to convert pressure into a rotating motion. This article describes the common features of all types. The main types are the internal combustion...