Takareunan

Takareunan is a Finnish noun meaning the rear edge or back edge of an object. The form takareunan is the genitive case used in phrases such as takareunan pituus, meaning the length of the rear edge. The word is a compound of taka, meaning back, and reuna, meaning edge, and it is common in technical Finnish to describe the edge that lies opposite a front or leading edge (etureuna).

In geometry, design, and manufacturing, takareuna denotes the boundary along the rear side of a figure or component. It is used in diagrams, engineering drawings, and product specifications to indicate the edge that trails behind relative to a defined front direction. Common expressions include takareunan linja (the line of the rear edge) and takareunan muoto (the shape of the rear edge), among others.

Takareunan is typically contrasted with etureuna, the front edge. The exact meaning can vary by field, but the underlying idea is the same: takareuna marks the rear-facing side of a shape or part. In some contexts, especially in aerodynamics or blade design, the English equivalent would be the trailing edge, which describes the boundary where flow leaves the surface.

Translation and usage: takareunan is usually translated as rear edge or back edge. In engineering and aviation texts, the term is often rendered as rear edge or trailing edge, depending on whether the emphasis is on the fixed rear boundary or the trailing flow behind the edge. The term is standard in Finnish technical vocabulary and is understood across engineering disciplines, though it is less common in everyday speech.