Un chaflán u ochava es un recurso urbanístico que consiste en unir con una línea oblicua los lados de las manzanas en sus esquinas, elimándose éstas, con el objetivo de mejorar la circulación y su visibilidad y ampliar los cruces, lo que provoca que las parcelas situadas en esos lugares tengan circunstancias físicas especiales.

http://es.wikipedia.org/wiki/Chaflán_(arquitectura)

In the realm of architecture, the base of the Taj Mahal mausoleum in Agra, India, is a cube with chamfered corners, thereby creating an octagonal architectural footprint.[2]

Many street corners (curbs) in Barcelona, Spain, and in Ponce, Puerto Rico, are chamfered. This allows for the turn while driving to be somewhat more comfortable as drivers do not need to slow down as much when making a turn as they would have to if the corner were a square 90 degrees. It also reduces the likelihood of tire damage.

http://en.wikipedia.org/wiki/Chamfer#Architecture

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Note added at 10 mins (2014-09-09 20:10:57 GMT)
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Use this procedure to chamfer 2 walls. Chamfering walls creates a new wall segment between 2 walls that are not parallel. Chamfering is useful when you are working with unique wall angles or architectural details.

You can chamfer walls by specifying distance or angle:

Using the distance option, you specify the length that each wall should be trimmed or extended until it meets the new wall segment or the other wall. If both chamfer distances are zero, the walls are extended until they intersect, but a new wall segment is not created.

http://knowledge.autodesk.com/support/autocad-architecture/d...

7. f. chaflán (‖ plano que, en lugar de esquina, une dos parámetros).
8. f. Parte de la acera correspondiente al chaflán.

http://lema.rae.es/drae/srv/search?id=wGkMU8PNQDXX2ucP9KsV





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Note added at 17 mins (2014-09-09 20:18:17 GMT)
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Here is a previous Sp > German question. You might find the reference entry useful.

http://www.proz.com/kudoz/spanish_to_german/construction_civ...

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Note added at 1 hr (2014-09-09 21:02:26 GMT)
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Barcelona is often praised by architects for its town planning. You will notice as you walk around the city that buildings on corners have a flat edge - this is known as a 'chamfered corner'. It means that crossroads have a more open feel and there is room on street corners for terraces - this helps to give Barcelona its sociable and communal atmosphere.

http://www.barcelona-tourist-guide.com/en/attractions/barcel...

Prominent in this property is the used of a chamfered front entrance gate. This front entrance into the property follows the chamfered pattern delineated by the city street at the corner of Salud and Aurora streets.

http://en.wikipedia.org/wiki/Casa_Oppenheimer